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.

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Ahmedabad, India

Population: 7 million

Commissioner: M. Thennarasan

Member since: 2022

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Rotterdam, The Netherlands

Population: 644,527

Mayor: Ahmed Aboutaleb

Member since: 2007

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Bengaluru, India

Population: 10.4 million

Chief Commissioner: Tushar Giri Nath

Member since: 2015

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Dhaka (North & South), Bangladesh

Steering Committee

Population: 20.3 million

Dhaka North (Steering Committee): Mayor Md. Atiqul Islam: Dhaka South: Mayor Sheikh Faizle Noor Taposh

Member since: 2006

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Mumbai, India

Population: 13.3 million

Commissioner: Iqbal Singh Chahal

Member since: 2007

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Ekurhuleni, South Africa

Population: 3.9 million

Member since: 2020

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Miami, United States

Population: 471,894

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

Population: 1.2 million

Member since: 2019

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Hangzhou, China

Population: 9.7 million

Mayor: Yao Gaoyuan

Member since: 2019

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Lisbon, Portugal

Population: 508,543

Mayor: Carlos Moedas

Member since: 2019

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Abidjan, Côte d’Ivoire

Population: 5.4 million

Governor: Robert Beugré Mambé

Member since: 2018

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Zhenjiang, China

Population: 3.2m

Mayor: Xu Shuhai

Member since: 2018

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Fuzhou, China

Population: 7.8 million

Mayor: Wu Xiande

Member since: 2018

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Guadalajara, Mexico

Population: 5.1 million

Mayor: Pablo Lemus

Member since: 2018

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Tel Aviv - Yafo, Israel

Population: 465,700

Mayor: Ron Huldai

Member since: 2017

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Qingdao, China

Population: 9.4 million

Mayor: Zhao Haozhi

Member since: 2017

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Medellín, Colombia

Population: 2.6 million

Mayor: Daniel Quintero

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: Yang Bahagia Datuk Seri Haji Mahadi Che Ngah

Member since: 2016

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Dakar, Senegal

Population: 1.4 million

Mayor: Barthélémy Toye Dias

Member since: 2016

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Chennai, India

Population: 7.7 million

Commissioner: Gagandeep Singh Bedi

Member since: 2016

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Chengdu, China

Population: 15.1 million

Mayor: Wang Fengchao

Member since: 2016

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Dalian, China

Population: 7 million

Mayor: Chen Shaowang

Member since: 2016

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Auckland, New Zealand

Population: 1.7 million

Mayor: Wayne Brown

Member since: 2015

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Accra, Ghana

Population: 2.2 million

Mayor: Elizabeth Sackey

Member since: 2015

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Kolkata, India

Population: 17.4 million

Commissioner: Binod Kumar

Member since: 2015

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Nanjing, China

Population: 8.4 million

Mayor: Chen Zhichang

Member since: 2015

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Guangzhou, China

Population: 14.9

Mayor: Guo Yonghang

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, Philippines

Population: 3.1 million

Mayor: Josefina "Joy" Belmonte

Member since: 2015

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Quito, Ecuador

Population: 2.8 million

Mayor: Santiago Guarderas

Member since: 2015

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Salvador, Brazil

Population: 3 million

Mayor: Bruno Reis

Member since: 2015

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Durban (eThekwini), South Africa

Population: 3.7 million

Mayor: Mxolisi Kaunda

Member since: 2015

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Amman, Jordan

Population: 4.3 million

Mayor: Yousef Shawarbeh

Member since: 2015

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Tshwane, South Africa

Population: 3.6 million

Member since: 2014

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Wuhan, China

Population: 11 million

Mayor: Cheng Yongwen

Member since: 2014

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Shenzhen, China

Population: 12.9 million

Mayor: Qin Weizhong

Member since: 2014

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Boston, United States

Population: 697,068

Acting Mayor: Michelle Wu

Member since: 2014

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Nairobi, Kenya

Population: 4.5 million

Governor: Johnson Arthur Sakaja

Member since: 2014

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Dar es Salaam, Tanzania

Population: 7.1 million

Lord Mayor: Omary S. Kumbilamoto

Member since: 2014

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Cape Town, South Africa

Population: 4.2 million

Mayor: Geordin Hill-Lewis

Member since: 2014

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Singapore, Singapore

Population: 5.8 million

Permanent Secretary: Leo Yip

Member since: 2012

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Vancouver, Canada

Population: 648,000

Mayor: Ken Sim

Member since: 2012

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Washington, DC, United States

Population: 703,332

Mayor: Muriel Bowser

Member since: 2012

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Oslo, Norway

Steering Committee

Population: 685,124

Governing Mayor: Raymond Johansen

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: 24.4 million

Mayor: Gong Zheng

Member since: 2005

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Santiago, Chile

Population: 7.7 million

Governor: Claudio Benjamin Orrego

Member since: 2009

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Rio de Janeiro, Brazil

Population: 6.6 million

Mayor: Eduardo Paes

Member since: 2007

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New York City, United States

Population: 8.6 million

Mayor: Eric Adams

Member since: 2005

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New Orleans, United States

Population: 393,663

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: 3.2 million

Mayor: José Luis Martínez-Almeida Navasqüés

Member since: 2005

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Los Angeles, United States

Population: 4.0 million

Mayor: Karen Bass

Member since: 2006

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Lima, Peru

Population: 9.5 million

Mayor: Rafael López Aliaga

Member since: 2007

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Lagos, Nigeria

Population: 23.9 million

Governor: Babajide Olusola Sanwo-Olu

Member since: 2007

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Karachi, Pakistan

Population: 15.7 million

Honourable Administrator: Murtaza Wahab

Member since: 2006

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Jakarta, Indonesia

Population: 10.5 million

Acting Governor: Heru Budi Hartono

Member since: 2006

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Istanbul, Turkey

Population: 15.5 million

Mayor: Ekrem İmamoğlu

Member since: 2006

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Ho Chi Minh City, Vietnam

Population: 9 million

Chairman: Phan Van Mai

Member since: 2009

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Hanoi, Vietnam

Population: 7.9 million

Chairman: Tran Sy Thanh

Member since: 2007

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Delhi NCT, India

Population: 18.5 million

Chief Minister: Arvind Kejriwal

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

Steering Committee

Population: 3.1 million

Mayor: Horacio Rodríguez Larreta

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: 8.7 million

Governor: Chadchart Sittipunt

Member since: 2006

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Athens, Greece

Population: 661,278

Mayor: Kostas Bakoyannis

Member since: 2007

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Addis Ababa, Ethiopia

Population: 3.8 million

Mayor: Adanech Abiebie

Member since: 2007

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Toronto, Canada

Population: 3 million

Member since: 2005

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Tokyo, Japan

Steering Committee

Population: 13.8 million

Governor: Yuriko Koike

Member since: 2006

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Sydney, Australia

Population: 250,389

Lord Mayor: Clover Moore

Member since: 2007

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Stockholm, Sweden

Steering Committee

Population: 978,113

Mayor: Karin Wanngård

Member since: 2005

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Seoul, Republic of Korea

Steering Committee

Population: 10 million

Mayor: Oh Se-hoon

Member since: 2006

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Seattle, United States

Population: 712,951

Mayor: Bruce Harrell

Member since: 2006

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São Paulo, Brazil

Population: 11.9 million

Mayor: Ricardo Nunes

Member since: 2005

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San Francisco, United States

Population: 884,537

Mayor: London Breed

Member since: 2005

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Rome, Italy

Population: 2.9 million

Mayor: Roberto Gualtieri

Member since: 2005

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Portland, United States

Population: 806,749

Mayor: Ted Wheeler

Member since: 2006

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Philadelphia, United States

Population: 1.6 million

Mayor: Jim Kenney

Member since: 2005

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Paris, France

Population: 2.2 million

Mayor: Anne Hidalgo

Member since: 2005

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Mexico City, Mexico

Population: 9.1 million

Mayor: Claudia Sheinbaum

Member since: 2005

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Melbourne, Australia

Population: 178,955

Lord Mayor: Sally Capp

Member since: 2005

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London, United Kingdom

Steering Committee

Population: 9 million

Mayor: Sadiq Khan

Member since: 2005

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Johannesburg, South Africa

Population: 5.3 million

Executive Mayor: Thapelo Amad

Member since: 2006

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Houston, United States

Population: 2.3 million

Mayor: Sylvester Turner

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: 161,257

Lord Mayor: Dr. Eckart Würzner

Member since: 2006

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Copenhagen, Denmark

Population: 619,425

Lord Mayor: Sophie Hæstorp Andersen

Member since: 2006

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Chicago, United States

Population: 2.7 million

Mayor: Lori Lightfoot

Member since: 2005

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Bogotá, Colombia

Steering Committee

Population: 8.3 million

Mayor: Claudia López

Member since: 2006

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Barcelona, Spain

Steering Committee

Population: 1.6 million

Mayor: Ada Colau

Member since: 2005

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Austin, United States

Population: 1.2 million

Mayor: Kirk Watson

Member since: 2006

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Amsterdam, The Netherlands

Population: 850,972

Mayor: Femke Halsema

Member since: 2007

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Berlin, Germany

Population: 3.8 million

Governing Mayor: Franziska Giffey

Member since: 2005

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Steering Committee Member

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