Our Cities

Around the world, C40 mayors and the cities they lead are taking ambitious, collaborative and urgent climate action that aligns with science-backed targets. They work together across borders in order to protect people and communities everywhere, and build a more sustainable, resilient and equitable future.

© Laure Rees-Smith - C40
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Fortaleza, Brazil

Population
2.4 million
Mayor
José Sarto
Member since
2024
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Ahmedabad, India

Population
7.5 million
Commissioner
M. Thennarasan
Member since
2022
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Rotterdam, The Netherlands

Population
660,258
Mayor
Carola Schouten
Member since
2007
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Bengaluru, India

Population
12.4 million
Chief Commissioner
Tushar Giri Nath
Member since
2015
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Dhaka (North & South), Bangladesh

Steering Committee

Population
22.5 million
Dhaka North: Administrator Md. Mahmudul Hasan
Dhaka South: Administrator Nazrul Islam
Member since
2006
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Mumbai, India

Population
13.5 million
Commissioner
Bhushan Gagrani
Member since
2007
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Ekurhuleni, South Africa

Population
3.9 million
Executive Mayor
Nkosindiphile Xhakaza
Member since
2020
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Miami, United States

Population
443,683
Mayor
Francis X. Suarez
Member since
2020
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Phoenix, United States

Steering Committee

Population
1.7 million
Mayor
Kate Gallego
Member since
2020
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Freetown, Sierra Leone

Steering Committee

Population
1.3 million
Mayor
Yvonne Aki-Sawyerr
Member since
2019
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Hangzhou, China

Population
12.5 million
Mayor
Yao Gaoyuan
Member since
2019
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Lisbon, Portugal

Population
515,022
Mayor
Carlos Moedas
Member since
2019
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Abidjan, Côte d’Ivoire

Steering Committee

Population
6 million
Minister-Governor
Ibrahima Cissé Bacongo
Member since
2018
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Zhenjiang, China

Population
3.2 million
Mayor
Xu Shuhai
Member since
2018
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Fuzhou, China

Population
4.7 million
Mayor
Wu Xiande
Member since
2018
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Guadalajara, Mexico

Population
5.3 million
Mayor
Verónica Delgadillo
Member since
2018
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Tel Aviv - Yafo, Israel

Population
498,915
Mayor
Ron Huldai
Member since
2017
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Qingdao, China

Population
10 million
Mayor
Zhao Haozhi
Member since
2017
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Medellín, Colombia

Steering Committee

Population
2.6 million
Mayor
Federico Gutiérrez
Member since
2016
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Montréal, Canada

Steering Committee

Population
2.1 million
Mayor
Valérie Plante
Member since
2016
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Kuala Lumpur, Malaysia

Population
1.8 million
Mayor
Maimunah Mohd Sharif
Member since
2016
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Dakar, Senegal

Population
1.5 million
Mayor
Barthélémy Toye Dias
Member since
2016
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Chennai, India

Population
8.3 million
Municipal Commissioner
J Kumaragurubaran IAS
Member since
2016
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Chengdu, China

Population
17.4 million
Mayor
Wang Fengchao
Member since
2016
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Dalian, China

Population
7.3 million
Mayor
Chen Shaowang
Member since
2016
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Auckland, New Zealand

Population
1.8 million
Mayor
Wayne Brown
Member since
2015
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Accra, Ghana

Population
2.3 million
Mayor
Elizabeth Sackey
Member since
2015
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Nanjing, China

Population
7.4 million
Mayor
Chen Zhichang
Member since
2015
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Guangzhou, China

Population
14.3 million
Mayor
Sun Zhiyang
Member since
2015
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Dubai, United Arab Emirates

Population
3.4 million
Secretary General
Abdulla Mohammed Al Basti
Member since
2015
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Quezon City, The Philippines

Population
3.2 million
Mayor
Josefina "Joy" Belmonte
Member since
2015
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Quito, Ecuador

Population
2.9 million
Mayor
Pabel Muñoz
Member since
2015
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Salvador, Brazil

Population
3.1 million
Mayor
Bruno Reis
Member since
2015
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Durban (eThekwini), South Africa

Population
4.1 million
Executive Mayor
Cyril Xaba
Member since
2015
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Amman, Jordan

Population
4.2 million
Mayor
Yousef Shawarbeh
Member since
2015
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Tshwane, South Africa

Population
3.9 million
Mayor
Nasiphi Moya
Member since
2014
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Wuhan, China

Population
12.2 million
Mayor
Sheng Yuechun
Member since
2014
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Shenzhen, China

Population
15.3 million
Mayor
Qin Weizhong
Member since
2014
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Boston, United States

Population
676,987
Mayor
Michelle Wu
Member since
2014
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Nairobi, Kenya

Steering Committee

Population
5 million
Governor
Sakaja Arthur Johnson
Member since
2014
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Dar es Salaam, Tanzania

Population
6.9 million
Lord Mayor
Omary S. Kumbilamoto
Member since
2014
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Cape Town, South Africa

Population
4.8 million
Mayor
Geordin Hill-Lewis
Member since
2014
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Singapore, Singapore

Population
5.6 million
Permanent Secretary
Leo Yip
Member since
2012
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Vancouver, Canada

Population
683,009
Mayor
Ken Sim
Member since
2012
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Washington, DC, United States

Population
693,819
Mayor
Muriel Bowser
Member since
2012
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Oslo, Norway

Steering Committee

Population
716,438
Governing Mayor
Eirik Lae Solberg
Member since
2012
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Yokohama, Japan

Population
3.8 million
Mayor
Takeharu Yamanaka
Member since
2008
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Warsaw, Poland

Population
1.8 million
Mayor
Rafał Trzaskowski
Member since
2007
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Shanghai, China

Population
24.5 million
Mayor
Gong Zheng
Member since
2005
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Santiago, Chile

Population
8.4 million
Governor
Claudio Benjamin Orrego
Member since
2009
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Rio de Janeiro, Brazil

Steering Committee

Population
6.8 million
Mayor
Eduardo Paes
Member since
2007
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New York City, United States

Population
8.8 million
Mayor
Eric Adams
Member since
2005
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New Orleans, United States

Population
392,133
Mayor
LaToya Cantrell
Member since
2006
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Milan, Italy

Steering Committee

Population
1.4 million
Mayor
Giuseppe Sala
Member since
2009
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Madrid, Spain

Population
3.4 million
Mayor
José Luis Martínez-Almeida Navasqüés
Member since
2005
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Los Angeles, United States

Population
3.8 million
Mayor
Karen Bass
Member since
2006
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Lima, Peru

Population
10.1 million
Mayor
Rafael López Aliaga
Member since
2007
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Lagos, Nigeria

Population
23.8 million
Governor
Babajide Olusola Sanwo-Olu
Member since
2007
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Karachi, Pakistan

Population
17.2 million
Mayor
Murtaza Wahab
Member since
2006
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Jakarta, Indonesia

Population
10.8 million
Acting Governor
Teguh Setyabudi
Member since
2006
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Istanbul, Turkey

Population
16.1 million
Mayor
Ekrem İmamoğlu
Member since
2006
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Ho Chi Minh City, Vietnam

Population
9.6 million
Chairman
Phan Van Mai
Member since
2009
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Hanoi, Vietnam

Population
8.6 million
Chairman
Tran Sy Thanh
Member since
2007
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Delhi NCT, India

Population
22.5 million
Chief Minister
Atishi Marlena Singh
Member since
2007
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Curitiba, Brazil

Population
2 million
Mayor
Rafael Greca
Member since
2005
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Buenos Aires, Argentina

Population
3.1 million
Mayor
Jorge Macri
Member since
2006
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Beijing, China

Population
21.7 million
Mayor
Yin Yong
Member since
2005
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Bangkok, Thailand

Population
5.7 million
Governor
Chadchart Sittipunt
Member since
2006
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Athens, Greece

Population
658,637
Mayor
Haris Doukas
Member since
2007
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Addis Ababa, Ethiopia

Population
5.4 million
Mayor
Adanech Abiebie
Member since
2007
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Toronto, Canada

Population
3.1 million
Mayor
Olivia Chow
Member since
2005
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Tokyo, Japan

Steering Committee

Population
14.1 million
Governor
Yuriko Koike
Member since
2006
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Sydney, Australia

Population
253,576
Lord Mayor
Clover Moore
Member since
2007
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Stockholm, Sweden

Population
1 million
Mayor
Karin Wanngård
Member since
2005
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Seoul, Republic of Korea

Steering Committee

Population
9.8 million
Mayor
Oh Se-hoon
Member since
2006
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Seattle, United States

Population
748,249
Mayor
Bruce Harrell
Member since
2006
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São Paulo, Brazil

Population
11.8 million
Mayor
Ricardo Nunes
Member since
2005
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San Francisco, United States

Population
874,519
Mayor
London Breed
Member since
2005
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Rome, Italy

Population
2.8 million
Mayor
Roberto Gualtieri
Member since
2005
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Portland, United States

Population
829,035
Mayor
Ted Wheeler
Member since
2006
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Philadelphia, United States

Population
1.6 million
Mayor
Cherelle Parker
Member since
2005
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Paris, France

Steering Committee

Population
2.2 million
Mayor
Anne Hidalgo
Member since
2005
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Mexico City, Mexico

Population
9.2 million
Mayor
Clara Brugada
Member since
2005
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Melbourne, Australia

Population
184,307
Lord Mayor
Nicholas Reece
Member since
2005
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London, United Kingdom

Steering Committee

Population
9.2 million
Mayor
Sadiq Khan
Member since
2005
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Johannesburg, South Africa

Population
6.1 million
Mayor
Dada Morero
Member since
2006
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Houston, United States

Population
2.4 million
Mayor
John Whitmire
Member since
2006
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Hong Kong, China

Steering Committee

Population
7.4 million
Secretary for Environment and Ecology
Tse Chin-wan
Member since
2007
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Heidelberg, Germany

Population
161,163
Lord Mayor
Dr. Eckart Würzner
Member since
2006
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Copenhagen, Denmark

Population
643,997
Acting Lord Mayor
Lars Weiss
Member since
2006
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Chicago, United States

Population
2.7 million
Mayor
Brandon Johnson
Member since
2005
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Bogotá, Colombia

Population
7.5 million
Mayor
Carlos Fernando Galán
Member since
2006
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Barcelona, Spain

Population
1.7 million
Mayor
Jaume Collboni
Member since
2005
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Austin, United States

Population
1.4 million
Mayor
Kirk Watson
Member since
2006
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Amsterdam, The Netherlands

Population
892,189
Mayor
Femke Halsema
Member since
2007
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Berlin, Germany

Population
3.7 million
Governing Mayor
Kai Wegner
Member since
2005
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  • Steering Committee Member

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