California

=== Twinned regions ===
California has [[City twinning|region twinning arrangements]] with:
*{{flagicon|Catalonia}} [[Catalonia]], autonomous community of {{flagicon|Spain}} [[Spain]]<ref>{{Cite web |title=Senate Concurrent Resolution No. 71 |url=http://soir.senate.ca.gov/scr71 |publisher=Senate Office of International Relations}}</ref>
*{{flagicon|Alberta}} [[Alberta]], province of {{flagicon|Canada}} [[Canada]]<ref name="Soir.senate.ca.gov">{{Cite web |title=California's Sister State Relationships &#124; Senate Office of International Relations |url=https://soir.senate.ca.gov/sisterstates |access-date=September 30, 2018 |publisher=Soir.senate.ca.gov}}</ref><ref>{{Cite web |title=California-Alberta Relations |url=http://economic.alberta.ca/documents/California-AB.pdf?0.8097911507356912 |archive-url=https://web.archive.org/web/20180929233318/http://economic.alberta.ca/documents/California-AB.pdf?0.8097911507356912 |archive-date=September 29, 2018 |access-date=September 29, 2018}}</ref>
*{{flagicon|Jeju Province}} [[Jeju Province]] of {{flagicon|Republic of Korea}} [[South Korea]]<ref>{{Cite web |title=ACR 42 Assembly Concurrent Resolution - CHAPTERED |url=http://www.leginfo.ca.gov/pub/05-06/bill/asm/ab_0001-0050/acr_42_bill_20050718_chaptered.html |access-date=March 2, 2023 |website=www.leginfo.ca.gov}}</ref>
*{{flagicon|China}} [[Guangdong]], province of {{flagicon|China}} [[China]]<ref>{{cite web |title=State of California and Guangdong Province Sister State Agreement |url=https://soir.senate.ca.gov/content/state-california-and-guangdong-province-sister-state-agreement |website=Senate Office of International Relations |access-date=October 27, 2023}}</ref>