Participating Cities
This is the list of participating cities for the 2025 City Nature Challenge. While this list is updated regularly, it may not reflect any last minute changes to a city’s participation. Please click on the link to your city for any changes to events in your area.
If your city is not listed here, we welcome you to join our global project and take part wherever you live. Note: To participate in the global project you must first ‘join’ the project, using the link near the top right corner. For all other cities listed below, there is no need to join your local project, though you may choose to do so. All observations made within the boundaries of participating cities between April 25 - 28 will automatically be added.
| Aalborg | Nordjylland | Denmark |
| Abbotsford | British Columbia | Canada |
| Abidjan | Abidjan | Côte d’Ivoire |
| Abu Dhabi | Abu Dhabi | United Arab Emirates |
| Abşeron Peninsula | Abşeron Peninsula | Azerbaijan |
| Accomack & Northampton Counties | Virginia | United States of America |
| Ada County | Idaho | United States of America |
| Agartala | Tripura | India |
| Agiabampo | Sonora | Mexico |
| Agra | Uttar Pradesh | India |
| Ahilyanagar | Maharashtra | India |
| Ahmedabad Gandhinagar | Gujarat | India |
| Ahome, Sinaloa | Ahome | Mexico |
| Aizawl-Mizoram | Mizoram | India |
| Alachua County | Florida | United States of America |
| Albuquerque | New Mexico | United States of America |
| Algoma District & Chippewa County | Ontario & Michigan | Canada and the United States of America |
| Allegheny and Shenandoah Mountains | Virginia | United States of America |
| Alta Floresta | Mato Grosso | Brazil |
| Amanalco de Becerra | Estado de México | Mexico |
| Amarillo Metro Area plus Hutchison County | Texas | United States of America |
| Amsterdam | North Holland | Netherlands |
| Amstetten - Waidhofen/Ybbs | Niederösterreich | Austria |
| Anantnag | Jammu and Kashmir | India |
| Annapolis Valley | Nova Scotia | Canada |
| Area Marina Protetta Punta Campanella | Campania | Italy |
| Area Metropolitana La Paz | La Paz | Bolivia |
| Area Metropolitana de Guadalajara | Jalisco | Mexico |
| Arequipa | Arequipa | Peru |
| Arrecife Alacranes | Yucatán | Mexico |
| Arrowhead Region | Minnesota | United States of America |
| Atenco | Estado de México | Mexico |
| Athens | Athens | Greece |
| Auroville | Tamil Nadu | India |
| Ayacucho | Ayacucho | Peru |
| Bakoumba | Haut-Ogooué | Gabon |
| Balkhash Area | Karaganda Region | Kazakhstan |
| Baltimore Metropolitan Area | Maryland | United States of America |
| Bamyan | Bamyan | Afghanistan |
| Bangalore Metropolitan Region | Karnataka | India |
| Bangalore Rural | Karnataka | India |
| Bangkhla | Chacheongsao | Thailand |
| Bangkok Metropolitan Region, Thailand | Bangkok Metropolitan Region | Thailand |
| Banyoles/Pla de l'Estany | Girona | Spain |
| Barcelona Metropolitan Area | Barcelona | Spain |
| Bargarh | Odisha | India |
| Barrancas de Cuernavaca | Morelos | Mexico |
| Barrie | Ontario | Canada |
| Baton Rouge | Louisiana | United States of America |
| Beira City | Sofala | Mozambique |
| Belo Horizonte | Minas Gerais | Brazil |
| Bend | Oregon | United States of America |
| Benewah County | Idaho | United States of America |
| Bergamo | Lombardy | Italy |
| Berks County | Pennsylvania | United States of America |
| Berkshire | Berkshire | England |
| Berlin | Brandenburg | Germany |
| Bethlehem | Pennsylvania | United States of America |
| Bhavnagar | Gujarat | India |
| Bhopal | Madhya Pradesh | India |
| Bhubaneswar | Odisha | India |
| Big Almaty | Almaty Region | Kazakhstan |
| Bila Tserkva | Kyiv oblast | Ukraine |
| Birmingham & Black Country | West Midlands | England |
| Bolton | Vermont | United States of America |
| Bonner County | Idaho | United States of America |
| Boston Area | Massachusetts | United States of America |
| Boundary County | Idaho | United States of America |
| Bowling Green and South Central Kentucky | Kentucky | United States of America |
| Bragança | Pará | Brazil |
| Brainerd Lakes Area | Minnesota | United States of America |
| Brandon & Area | Manitoba | Canada |
| Brasília e Região | Brasília e Região | Brazil |
| Bratislava | Bratislava Region | Slovakia |
| Brazos Valley | Texas | United States of America |
| Bremen & Bremerhaven | Freie Hansestadt Bremen | Germany |
| Brighton & Eastern Downs | Sussex | England |
| Brisbane | Queensland | Australia |
| Brno | South Moravia | Czech Republic |
| Brookings County | South Dakota | United States of America |
| Broward County | Florida | United States of America |
| Brussels | Brussels-Capital Region | Belgium |
| Buenos Aires y CABA | Buenos Aires | Argentina |
| Buffalo City Municipality | Eastern Cape | South Africa |
| Butler County | Ohio | United States of America |
| CBRM | Nova Scotia | Canada |
| Cajamarca | Cajamarca | Peru |
| Calgary Metropolitan Region | Alberta | Canada |
| Callahuanca | Huarochirí | Peru |
| Canyon County | Idaho | United States of America |
| Cape Winelands | Western Cape | South Africa |
| Capricorn District | Limpopo | South Africa |
| Cardiff & Newport | Cardiff & Newport | Wales |
| Carson City | Nevada | United States of America |
| Celestún | Yucatán | Mexico |
| Central Botswana | Central Botswana | Botswana |
| Central Taiwan | 0 | Taiwan |
| Centre littoral Guyane | French Guiana | France |
| Cerro de la Calavera | Baja California Sur | Mexico |
| Ceske Budejovice | South Bohemia | Czech Republic |
| Chaco | Chaco | Argentina |
| Chandigarh | Chandigarh | India |
| Charlotte Metro Region | North Carolina | United States of America |
| Charlottesville Region | Virginia | United States of America |
| Charlottetown | Prince Edward Island | Canada |
| Chase County | Kansas | United States of America |
| Chennai | Tamil Nadu | India |
| Chester Region | Cheshire | England |
| Chhatarpur | Madhya Pradesh | India |
| Chiang Mai | Chiang Mai | Thailand |
| Chiang Rai | Chiang Rai | Thailand |
| Chiayi-Yunlin | 0 | Taiwan |
| Chicagoland Region | Illinois, Indiana, Wisconsin | United States of America |
| Chihuahua | Chihuahua | Mexico |
| Chimoio cidade, gondola posto administrativo de chiogo | Distrito de Gôndola | Mozambique |
| Cidade de Mocuba, Mocuba Sede, Mugeba, Namajavira, Alto Benfica, Muaquiua | Zambézia | Mozambique |
| Cidade de Tete | Tete-Tete | Mozambique |
| Cincinnati-Hamilton County | Ohio | United States of America |
| City of Cape Town | Western Cape | South Africa |
| City of Logan | Queensland | Australia |
| City of Niagara Falls | Ontario | Canada |
| City of Nolanville | Texas | United States of America |
| City of Nottingham | Nottinghamshire | England |
| City of Salem | Oregon | United States of America |
| City of St. Catharines | Ontario | Canada |
| Ciudad Obregón | Sonora | Mexico |
| Ciudad de Guatemala | Departamento de Guatemala | Guatemala |
| Ciudad de México | Ciudad de México | Mexico |
| Ciudad de Panamá y San Miguelito | Panamá | Panama |
| Clark County | Ohio | United States of America |
| Clearwater County | Idaho | United States of America |
| Cobija, Pando | Nicolas Suarez | Bolivia |
| Cochabamba | Cochabamba | Bolivia |
| Coimbatore | Tamil Nadu | India |
| Colima | Colima | Mexico |
| Colmenar Viejo | Madrid | Spain |
| Colorado West Slope | Colorado | United States of America |
| Columbus | Ohio | United States of America |
| Congleton | Cheshire East | England |
| Copalita-Huatulco | Oaxaca | Mexico |
| Corrientes | Corrientes | Argentina |
| Corumbá, Ladário | Mato Grosso do Sul | Brazil |
| Costa de Colima | Colima | Mexico |
| Coutada Oficial 5 | Sofala | Mozambique |
| Coventry, Solihull and Warwickshire | West Midlands | England |
| Crevillent i Espais Naturals | Comunitat Valenciana | Spain |
| Culiacán | Sinaloa | Mexico |
| Curaçao | Curaçao | Curaçao |
| Cusco | Cusco | Peru |
| Cuttack | Odisha | India |
| Córdoba | Córdoba | Argentina |
| Cúcuta | Cúcuta | Colombia |
| Dallas/Fort Worth | Texas | United States of America |
| Darjeeling | West Bengal | India |
| Darwin and Palmerston | Northern Territory | Australia |
| Dehradun | Uttarakhand | India |
| Delhi NCR | Delhi | India |
| Denver-Boulder | Colorado | United States of America |
| Desafío Santiago del Estero | Santiago del Estero | Argentina |
| Detroit Tri-County Area | Michigan | United States of America |
| Digboi | Assam | India |
| District of Marromeu | Sofala | Mozambique |
| Distrito de San Ramón | Chanchamayo | Peru |
| Distrito de Satipo | Provincia de Satipo | Peru |
| Diu | Dadra and Nagar Haveli and Daman and Diu | India |
| Dornbirn/Vorarlberg | Vorarlberg | Austria |
| Dos Bocas | Tabasco | Mexico |
| Dover | New Hampshire | United States of America |
| Dubai | Dubai | United Arab Emirates |
| Dundee | Scotland | Scotland |
| Düsseldorf | Nordrhein-Westfalen | Germany |
| Edmonton metro area | Alberta | Canada |
| Ekaterinburg | Sverdlovsk region | Russia |
| El Paso | Texas | United States of America |
| El Vendrell | El Vendrell | Spain |
| El Álamo-Navalcarnero-Casarrubios | Madrid | Spain |
| Eluru District | Andhra Pradesh | India |
| Endless Mountains Region | Pennsylvania | United States of America |
| Ensenada | Baja California | Mexico |
| Entre Ríos | Entre Ríos | Argentina |
| Erie County | Pennsylvania | United States of America |
| Estado de Hidalgo | Hidalgo | Mexico |
| Fairfield & Westchester County | Connecticut, New York | United States of America |
| Ferrara | Emilia-Romagna | Italy |
| Florida - Georgia iNaturalist Challenge | Florida, Georgia | United States of America |
| Fort Collins | Colorado | United States of America |
| Fort Erie | Ontario | Canada |
| Fort Wayne Area | Indiana | United States of America |
| Fortaleza e Região Metropolitana | Ceará | Brazil |
| Foz do Iguaçu | Paraná | Brazil |
| Frankfort | Kentucky | United States of America |
| Frankfurt am Main | Hessen | Germany |
| Fredericton & York County | New Brunswick | Canada |
| Free State | Free State | South Africa |
| Freising (Landkreis) | Bavaria | Germany |
| Fresno & Madera Counties | California | United States of America |
| Funes Santa Fe | Santa Fe | Argentina |
| Gallatin County | Montana | United States of America |
| Gangtok | Sikkim | India |
| Garden Route | Western Cape | South Africa |
| Gatineau et environs | Quebec | Canada |
| Gert Sibande District | Mpumalanga | South Africa |
| Getafe | Madrid | Spain |
| Glamorgan | Glamorgan | Wales |
| Goa | Goa | India |
| Gorari | Bihar | India |
| Gorongosa | Sofala | Mozambique |
| Granadero Baigorria, Isla de los Mástiles | Santa Fe | Argentina |
| Grande Curitiba | Grande Curitiba | Brazil |
| Grande Porto Alegre | Rio Grande do Sul | Brazil |
| Grande Rio e Região Hidrográfica da Baía da Guanabara | Rio de Janeiro | Brazil |
| Graz bis zum Vulkanland | Styria | Austria |
| Greater Adelaide | South Australia | Australia |
| Greater Atlanta Area | Georgia | United States of America |
| Greater Austin | Texas | United States of America |
| Greater Belfast | 0 | Northern Ireland |
| Greater Burlington Area | Vermont | United States of America |
| Greater Chattanooga Area | Tennessee | United States of America |
| Greater Columbia Area | South Carolina | United States of America |
| Greater Des Moines | Iowa | United States of America |
| Greater Edinburgh | Greater Edinburgh | Scotland |
| Greater Francistown | North East | Botswana |
| Greater Glasgow | Greater Glasgow | Scotland |
| Greater Haikou | Hainan | China |
| Greater Kansas City Metro Area | Kansas, Missouri | United States of America |
| Greater Lansing Area | Michigan | United States of America |
| Greater London | Greater London | England |
| Greater Manchester | Greater Manchester | England |
| Greater Melbourne | Victoria | Australia |
| Greater Philadelphia Area | Pennsylvania | United States of America |
| Greater Phoenix | Arizona | United States of America |
| Greater Portland-Vancouver Metro Area | Oregon, Washington | United States of America |
| Greater Richmond Metropolitan Area | Virginia | United States of America |
| Greater St. Louis Region | Illinois, Missouri | United States of America |
| Greater Summerside Area | Prince Edward Island | Canada |
| Greater Sydney | New South Wales | Australia |
| Greater Victoria | British Columbia | Canada |
| Guadalix De La Sierra | Madrid | Spain |
| Guimarães | Guimarães | Portugal |
| Guwahati | Assam | India |
| Gyalshing | Sikkim | India |
| Göttingen Stadt & Landkreis | Lower Saxony | Germany |
| Halifax Regional Municipality | Nova Scotia | Canada |
| Hamburg | Hamburg | Germany |
| Hartford & New Haven Counties | Connecticut | United States of America |
| Hat Yai | Songkhla | Thailand |
| Heart of Texas | Texas | United States of America |
| Herefordshire | Herefordshire | England |
| High Peak | High Peak | England |
| Hong Kong | Hong Kong | China |
| Hosur | Tamil Nadu | India |
| Houston-Galveston | Texas | United States of America |
| Hsinchu | 0 | Taiwan |
| Huaraz | 0 | Peru |
| Huichapan-Tecozautla | Hidalgo | Mexico |
| Hull | Yorkshire | England |
| Hyderabad Telangana | Telangana | India |
| Idaho County | Idaho | United States of America |
| Imphal Valley | Manipur | India |
| Indianapolis Metropolitan Area | Indiana | United States of America |
| Indore | Madhya Pradesh | India |
| Industrieviertel | Industrieviertel | Austria |
| Inhambane | Inhambane | Mozambique |
| Inhassoro | Inhambane | Mozambique |
| Inland Empire | California | United States of America |
| Innsbruck Stadt und Land | Tirol | Austria |
| Irkutsk | Irkutsk region | Russia |
| Ishikawa | Ishikawa | Japan |
| Isola di Pantelleria | Trapani (Sicilia) | Italy |
| Ivano-Frankivsk | Ivano-Frankivsk | Ukraine |
| Ixtapaluca | Estado de México | Mexico |
| Jabalpur | Madhya Pradesh | India |
| Jaipur | Rajasthan | India |
| Jalgaon | Maharashtra | India |
| Jardín | Antioquia | Colombia |
| Jefferson County | Texas | United States of America |
| Jerantut; Raub; Maran | Jerantut; Raub; Maran | Malaysia |
| Joburg | Gauteng | South Africa |
| Johnson County | Iowa | United States of America |
| Jujuy | Jujuy | Argentina |
| Junín | Junín | Peru |
| Kadmath, Kavarati, Agatti, Androth, Amini, Minicoy, Chetlat, Bitra, Kalpeni Islands of Lakshadweep | Lakshadweep | India |
| Kahramanmaraş | Kahramanmaraş | Turkey |
| Kajiado | Kajiado | Kenya |
| Kanawha County West Virginia | West Virginia | United States of America |
| Kano state | Kano State | Nigeria |
| Kaohsiung | 0 | Taiwan |
| Karaganda | Karaganda region | Kazakhstan |
| Karlovac | 0 | Croatia |
| Katima Mulilo | Zambezi | Namibia |
| Kerala | Kerala | India |
| Kern County | California | United States of America |
| Kharkiv Region | Kharkiv Region | Ukraine |
| Khon Kaen | Khon Kaen | Thailand |
| Kiel Region | Schleswig-Holstein | Germany |
| Kingston | Ontario | Canada |
| Kitsap County | Washington | United States of America |
| Klang Valley | Klang Valley | Malaysia |
| Knox Area | Tennessee | United States of America |
| Kolhapur | Maharashtra | India |
| Kolkata | West Bengal | India |
| Konotop | Sumy region | Ukraine |
| Kootenai County | Idaho | United States of America |
| Kota | Rajasthan | India |
| Kraków | Małopolskie województwo | Poland |
| Kreis Segeberg | Segeberg | Germany |
| Krems - Wachau - Melk | Lower Austria | Austria |
| Kumphawapi | Udon Thani | Thailand |
| Kyiv | Kyiv | Ukraine |
| La Libertad | La Libertad | Peru |
| La Pampa | La Pampa | Argentina |
| La Paz | Baja California Sur | Mexico |
| La Ventana, El Sargento, Los Planes, Agua Amarga | Baja California Sur | Mexico |
| Laguna de Términos | Campeche | Mexico |
| Lahore | Punjab | Pakistan |
| Lake County | California | United States of America |
| Lanca di Gussola | Cremona | Italy |
| Lancashire | North West England | England |
| Latah County | Idaho | United States of America |
| Launceston & Tamar Valley | Tasmania | Australia |
| Lebrija | Santander | Colombia |
| Lecheng | Central District | Botswana |
| Leiden | South Holland | Netherlands |
| Lethbridge | Alberta | Canada |
| Lewis County | Idaho | United States of America |
| Lexington-Fayette County | Kentucky | United States of America |
| Lichinga | Niassa | Mozambique |
| Lima | Lima | Peru |
| Limerick City | Limerick | Ireland |
| Lincoln County | Montana | United States of America |
| Lincoln, Lancaster County | Nebraska | United States of America |
| Liverpool City Region | Merseyside | England |
| Loja y sus alrededores | Loja | Ecuador |
| London, Ontario | Ontario | Canada |
| Los Angeles County | California | United States of America |
| Los Cabos | Los Cabos | Mexico |
| Louisville Metro | Kentucky | United States of America |
| Lower Rio Grande Valley | Texas | United States of America |
| Luxembourg | Luxembourg | Luxembourg |
| Mabote Village, Maxixe | Inhambane | Mozambique |
| Macao SAR | Macao SAR | China |
| Madrid | Madrid | Spain |
| Madurai | Tamil Nadu | India |
| Makana & Ndlambe | Eastern Cape | South Africa |
| Malyn urban territorial community | Zhytomyr region | Ukraine |
| Manchester | New Hampshire | United States of America |
| Mangan | Sikkim | India |
| Maputo | Maputo | Mozambique |
| Mar del Plata / Mar Chiquita | Buenos Aires | Argentina |
| Marabá | Pará | Brazil |
| Marchegg | Lower Austria | Austria |
| Marquette | Michigan | United States of America |
| Marracuene | Maputo | Mozambique |
| Marseille des collines à la mer | Provence Alpes Cote d'Azur | France |
| Mashhad | Khorasan Razavi | Iran |
| Matagorda County | Texas | United States of America |
| Matatiele | Eastern Cape | South Africa |
| Mati City | Davao Region | Philippines |
| Matola | Maputo | Mozambique |
| Matola Rio | Maputo | Mozambique |
| Matutuine | Maputo | Mozambique |
| Mecula | Niassa Mecula | Mozambique |
| Memba | Nampula | Mozambique |
| Memphis-Shelby County | Tennessee | United States of America |
| Mendoza | Mendoza | Argentina |
| Mesorregião Vale do Itajaí | Santa Catarina | Brazil |
| Messina | Sicily | Italy |
| Metro Vancouver Regional District | British Columbia | Canada |
| Mexicali | Baja California | Mexico |
| Midi Occitan | Occitanie | France |
| Milazzo | Sicily | Italy |
| Minneapolis-St. Paul Metropolitan Area | Minnesota | United States of America |
| Misiones | Misiones | Argentina |
| Missoula County | Montana | United States of America |
| Mittelkärnten | Carinthia | Austria |
| Moamba | Maputo | Mozambique |
| Moncton & Westmorland County | New Brunswick | Canada |
| Monte Pisano | Tuscany | Italy |
| Monterey Bay Area | California | United States of America |
| Monterrey Zona Metropolitana | Nuevo Leon | Mexico |
| Moquegua | Moquegua | Peru |
| Moscow Region | Moscow Region | Russia |
| Mount Pleasant, Titus County | Texas | United States of America |
| Mount Washington Valley Area | New Hampshire | United States of America |
| Mumbai | Maharashtra | India |
| Municipality of Kincardine | Ontario | Canada |
| Municipio de Alpiarça | Ribatejo | Portugal |
| Municipio de Caicedo | Antioquia | Colombia |
| Municipio de Catemaco | Veracruz | Mexico |
| Municipio de Durango | Durango | Mexico |
| Municipio de Loreto Baja California Sur | Baja California Sur | Mexico |
| Municipio de San Andres Tuxtla | Veracruz | Mexico |
| Municipio de Sucre | Chuquisaca | Bolivia |
| Municipio de Taxco de Alarcón | Guerrero | Mexico |
| Mustang Island | Texas | United States of America |
| Mykolaiv | Mykolaiv region | Ukraine |
| Mysore | Karnataka | India |
| Málaga | Málaga | Spain |
| Nacala-porto; Jangamo; Mahelene | Nampula; Nacala-Porto | Mozambique |
| Nagaland | Nagaland | India |
| Nagpur | Maharashtra | India |
| Nakhon Si Thammarat | Nakhon Si Thammarat | Thailand |
| Nalanda | Bihar | India |
| Namchi | Sikkim | India |
| Nampula, Moma | Nampula, Moma | Mozambique |
| Nanakmatta | Uttarakhand | India |
| Nashik | Maharashtra | India |
| Nashua | New Hampshire | United States of America |
| Nashville | Tennessee | United States of America |
| Nationalparkregion Gesäuse | Gesaeuse | Austria |
| Nelson Mandela Bay | Eastern Cape | South Africa |
| Neusiedler See | Neusiedler See | Austria |
| New York City | New York | United States of America |
| NewTaipei-keelung | 0 | Taiwan |
| Nez Perce County | Idaho | United States of America |
| Norte del Altiplano Potosino | San Luis Potosí | Mexico |
| North East England | North East England | England |
| Northeast Florida | Florida | United States of America |
| Northeast Ohio | Ohio | United States of America |
| Northeast Pennsylvania | Pennsylvania | United States of America |
| Northeast Tennessee | Tennessee | United States of America |
| Northeast Wisconsin | Wisconsin | United States of America |
| Northern Botswana | North West, Chobe, Ghanzi Districts | Botswana |
| Odesa | Odesa | Ukraine |
| Orange County | California | United States of America |
| Orange County, FL | Florida | United States of America |
| Oriente de Cundinamarca | Oriente de Cundinamarca | Colombia |
| Oruro | Oruro | Bolivia |
| Osnabrück Stadt / Land | Niedersachsen | Germany |
| Ostrava | Czech Republic | Czech Republic |
| Ottawa | Ontario | Canada |
| Overstrand | Western Cape | South Africa |
| Oxfordshire | Oxfordshire | England |
| O‘ahu | Hawaii | United States of America |
| Palouse Region | Idaho, Washington | United States of America |
| Paris | Île De France | France |
| Paris | Texas | United States of America |
| Park County | Montana | United States of America |
| Parque Nacional Isla Isabel | Nayarit | Mexico |
| Patrick County | Virginia | United States of America |
| Pelotas e Região Imediata | Rio Grande do Sul | Brazil |
| Pemba | Cabo Delgado | Mozambique |
| Pend Orielle County | Washington | United States of America |
| Penza Region | Penza Oblast | Russia |
| Pereira, Área metropolitana | 0 | Colombia |
| Perth & Greater Regional Western Australia | Western Australia | Australia |
| Petén | Petén | Guatemala |
| Phitsanulok province | Phitsanulok | Thailand |
| Phnom Penh | Phnom Penh | Cambodia |
| Phulbani | Odisha | India |
| Piedmont | North Carolina | United States of America |
| Pierre/Fort Pierre | South Dakota | United States of America |
| Pietermaritzburg | Kwa-Zulu Natal | South Africa |
| Pima County | Arizona | United States of America |
| Pimpri Chinchwad | Maharashtra | India |
| Pittsburgh Region | Pennsylvania | United States of America |
| Polk County | Florida | United States of America |
| Portofino | Genova | Italy |
| Potchefstroom | North West | South Africa |
| Potosí | Potosí | Bolivia |
| Poza Rica | Veracruz | Mexico |
| Prague | Czech Republic | Czech Republic |
| Predazzo, Tesero, Moena | Trento | Italy |
| Prelog | 0 | Croatia |
| Providence Area | Rhode Island | United States of America |
| Province of Palermo | Sicily | Italy |
| Provincia di Taranto | Provincia di Taranto | Italy |
| Pucallpa | Ucayali | Peru |
| Puducherry | Puducherry | India |
| Puebla y Zona Metropolitana | Puebla | Mexico |
| Puerto Quito | Pichincha | Ecuador |
| Pune City | Maharashtra | India |
| Puttur | Karnataka | India |
| Quelimane | Zambézia | Mozambique |
| Quito; San Miguel de los Bancos | Pichincha | Ecuador |
| Raipur | Chhattisgarh | India |
| Rajapalayam | Tamil Nadu | India |
| Rajgir | Bihar | India |
| Ranchi District | Jharkhand | India |
| Randolph and Tucker Counties | West Virginia | United States of America |
| Rangamati | Chittagong | Bangladesh |
| Rayagada | Odisha | India |
| Rayong City | Rayong | Thailand |
| Red Deer Area | Alberta | Canada |
| Regina and Area | Saskatchewan | Canada |
| Region Elsbeere Wienerwald | Lower Austria | Austria |
| Região Tocantina | Maranhão | Brazil |
| Región Puno | Puno | Peru |
| Regno di Nettuno AMP | Campania | Italy |
| Reno - Sparks | Nevada | United States of America |
| Reserva Especial do Niassa; Majune | Niassa | Mozambique |
| Rheinisches Revier | Rheinisches Revier | Germany |
| Riberalta | Beni | Bolivia |
| Richards Bay; King Cetswayo, Umkhanyakude and Zululand Districts | KwaZulu Natal | South Africa |
| Richmond | British Columbia | Canada |
| Rijeka | 0 | Croatia |
| Rio Branco e Leste do Acre | Acre | Brazil |
| Rivas Vaciamadrid | Madrid | Spain |
| Rivers State, Gokana | Rivers State | Nigeria |
| Riviera Maya | Quintana Roo | Mexico |
| Roanoke County | Virginia | United States of America |
| Rochester Metropolitan Area | New York | United States of America |
| Rock River Valley | Illinois | United States of America |
| Roma | Roma | Italy |
| Roraima | Roraima | Brazil |
| Rosario | Santa Fe | Argentina |
| Région de Québec | Québec | Canada |
| Río Negro | Rio Negro | Argentina |
| Río Soritor | San Martìn., Nuevo Cajamarca, Rìo Soritor | Peru |
| Sabana de Bogotá | Sabana de Bogotá | Colombia |
| Sacramento Region | California | United States of America |
| Salta | Salta | Argentina |
| Salzburg | Salzburg | Austria |
| San Antonio Metro Area | Texas | United States of America |
| San Blas, Nayarit | Nayarit | Mexico |
| San Cristobal de Las Casas | Chiapas | Mexico |
| San Diego County | California | United States of America |
| San Francisco Bay Area | California | United States of America |
| San Francisco de Macoris | Duarte | Dominican Republic |
| San Jeronimo de Surco | Lima | Peru |
| San Lorenzo de Quinti | Huarochiri/Lima | Peru |
| San Luis Obispo County | California | United States of America |
| Sangli City | Maharashtra | India |
| Santa Barbara County | California | United States of America |
| Santa Cruz | Santa Cruz | Argentina |
| Santa Cruz | Bolivia | Bolivia |
| Santa Fe Area | New Mexico | United States of America |
| Santa Pola | Comunidad Valenciana | Spain |
| Santa Teresa | Espírito Santo | Brazil |
| Saskatoon | Saskatchewan | Canada |
| Savannah Low Country and Coastal Georgia | Georgia | United States of America |
| Sciacca (AG) | Sicily | Italy |
| Seattle-Tacoma Metropolitan Area | Washington | United States of America |
| Sevilla CNC Area | Sevilla | Spain |
| Sferracavallo District, Palermo, Sicily | Sicily | Italy |
| Shasta County | California | United States of America |
| Sherbrooke | Québec | Canada |
| Shillong | Meghalaya | India |
| Shoshone County | Idaho | United States of America |
| Siena | Tuscany | Italy |
| Sierra de Guadalupe, Valle de México | Valle de México | Mexico |
| Silver City Area | New Mexico | United States of America |
| Sisal | Yucatán | Mexico |
| Smolensk | Smolensk Region | Russia |
| Solan | Himachal Pradesh | India |
| Solidaridad | Quintana Roo | Mexico |
| South Andaman County | Andaman and Nicobar Islands | India |
| South Florida | Florida | United States of America |
| Southcoast Massachusetts | Massachusetts | United States of America |
| Southern Botswana | Southern Botswana | Botswana |
| Southern Kruger, Mbombela and Surrounding Areas | Mpumalunga | South Africa |
| Southern Overberg | Western Cape | South Africa |
| Southwest Louisiana | Louisiana | United States of America |
| Southwest Piedmont | Virginia | United States of America |
| Southwest Virginia | Virginia | United States of America |
| Spokane | Washington | United States of America |
| Srinagar | Jammu and Kashmir | India |
| St. Pölten | Lower Austria | Austria |
| Staffordshire & Stoke-on-Trent | West Midlands | England |
| Stanislaus County | California | United States of America |
| Stillwater | Oklahoma | United States of America |
| Sunshine Coast LGA | Queensland | Australia |
| Surat | Gujarat | India |
| Surin | Surin | Thailand |
| Sussundenga | Manica | Mozambique |
| Swansea | Swansea | Wales |
| São Paulo e região metropolitana | São Paulo | Brazil |
| Tacna | Tacna | Peru |
| Tagum City | Davao del Norte | Philippines |
| Tainan | 0 | Taiwan |
| Taipei | 0 | Taiwan |
| Taitung-Pingtung | 0 | Taiwan |
| Takuapa/Phang-Nga | Phang-Nga | Thailand |
| Tambopata | Tambopata | Peru |
| Taoyuan | 0 | Taiwan |
| Tapachula | Chiapas | Mexico |
| Taranaki | Taranaki | New Zealand |
| Tarija | Tarija | Bolivia |
| Te Upoko o te Ika / Wellington Region | Wellington | New Zealand |
| Tecámac | Tecamac | Mexico |
| Tehran | Tehran | Iran |
| Tequixquiac | Estado de México | Mexico |
| Ternopil region | Ternopil region | Ukraine |
| Terra d'Arneo | Apulia | Italy |
| Texas Big Country | Texas | United States of America |
| Texcoco de Mora | Estado de México | Mexico |
| Thane District | Maharashtra | India |
| The Grand Strand | South Carolina | United States of America |
| Thessaloniki | 0 | Greece |
| Thimphu | Thimphu | Bhutan |
| Thohoyandou | Limpopo | South Africa |
| Thompson-Nicola Regional District | British Columbia | Canada |
| Thunder Bay District | Ontario | Canada |
| Thung Song Municipality | Thung Song Municipality | Thailand |
| Thurston County, Washington | Washington | United States of America |
| Tierra del Fuego | Tierra del Fuego | Argentina |
| Tijuana | Baja California | Mexico |
| Tiohtià:ke/Grand Montréal/Greater Montreal Area | Quebec | Canada |
| Tiruchirapalli | Tamil Nadu | India |
| Tirupati | Andhra Pradesh | India |
| Tizimín | Yucatán | Mexico |
| Tokyo | Tokyo | Japan |
| Torino | Piemonte | Italy |
| Toronto and GTA | Ontario | Canada |
| Trento Cluster Biodiversità Italia | Trento | Italy |
| Triangle Area | North Carolina | United States of America |
| Trinidad | Trinidad | Bolivia |
| Tshwane | Gauteng | South Africa |
| Tucumán | Tucumán | Argentina |
| Tulare County | California | United States of America |
| Tulum | Quintana Roo | Mexico |
| Tuxpan | Veracruz | Mexico |
| Tuxtla Gutiérrez | Chiapas | Mexico |
| Tyler/East Texas | Texas | United States of America |
| Tāmaki Makaurau/Auckland | Auckland | New Zealand |
| Ugu District | KwaZulu-Natal | South Africa |
| Uherskohradišťsko | Zlín | Czech Republic |
| Ukraine | 0 | Ukraine |
| Utah's Wasatch Front | Utah | United States of America |
| Uzhhorod | Zakarpattia Oblast | Ukraine |
| Valle de Aburrá | Antioquia | Colombia |
| Ventura County | California | United States of America |
| Veselsko | Jihomoravský kraj, Zlínský kraj | Czech Republic |
| Vilankulo | Inhambane | Mozambique |
| Vile et Eurométropole de Strasbourg | Alsace | France |
| Villa Rica | Georgia | United States of America |
| Villafruela | Burgos | Spain |
| Vinnytsia urban hromada | Vinnytsia Region | Ukraine |
| Virginia Pinelands | Virginia | United States of America |
| Visakhapatnam | Andhra Pradesh | India |
| Volusia County | Florida | United States of America |
| Walker & Trinity County Texas | Texas | United States of America |
| Wallowa County | Oregon | United States of America |
| Washington DC Metro Area | Maryland, Virginia, Washington, D.C., West Virginia | United States of America |
| Waterberg | Limpopo | South Africa |
| Wekiva Wild and Scenic River System | Florida | United States of America |
| Welland | Ontario | Canada |
| Wellesley MA | Massachusetts | United States of America |
| Weskus | Western Cape | South Africa |
| West Michigan | Michigan | United States of America |
| West of England (Bristol and Bath) | Bristol | England |
| Western Mass | Massachusetts | United States of America |
| Western North Carolina | North Carolina | United States of America |
| Wichita Falls, TX - Rolling Plains Chapter TMN Region | Texas | United States of America |
| Wien | Wien | Austria |
| Wild Coast | Eastern Cape | South Africa |
| Wilmington | North Carolina | United States of America |
| Windhoek | Khomas | Namibia |
| Winnipeg Region | Manitoba | Canada |
| Xai xai | Xai xai | Mozambique |
| Yahotyn Supii Lake | Boryspil region | Ukraine |
| Yahualica de Gonzalez Gallo | Jalisco | Mexico |
| Yilan-Hualien | Taiwan | Taiwan |
| Yopal | Casanare | Colombia |
| York | Yorkshire | England |
| Yurimaguas | Alto Amazonas - Loreto | Peru |
| Zagreb | Zagreb | Croatia |
| Zapotiltic | Jalisco | Mexico |
| Zaragoza | Zaragoza | Spain |
| Zarzal | Valle del Cauca | Colombia |
| Zhytomyr | Zhytomyr Oblast | Ukraine |
| Zona Metropolitana Delicias | Chihuahua | Mexico |
| Zona Metropolitana de Morelia | Michoacán | Mexico |
| Zona Metropolitana de Pamplona / Iruña | Navarra | Spain |
| Zona Metropolitana de la Laguna | Coahuila; Durango | Mexico |
| Zona Metropolitana del Valle de Toluca | Estado de México | Mexico |
| Zone umide di Capitanata | Puglia | Italy |
| eThekwini Metropolitan Municipality | KwaZulu-Natal | South Africa |
| iLembe | KwaZulu-Natal | South Africa |
| Área Metropolitana de Bucaramanga | Santander | Colombia |
| Ōtautahi/Christchurch | Canterbury | New Zealand |