John Duncan

John Duncan is an American attorney and politician currently serving as the 52nd mayor of Coronado, California. A member of the Republican Party, he previously served on the Coronado City Council from 2022 to 2024.

Early life and education Duncan earned a Bachelor of Arts in political science from the University of Southern California. He received his Juris Doctor from the University of San Diego School of Law, where he served as Constitutional Law Chair on the Appellate Moot Court Board. He is admitted to practice law in California, Texas, the state of Washington, and Washington, D.C.

Political career

City Council Duncan was elected to the Coronado City Council in November 2022. Prior to his election, he served on several city and community bodies, including the Coronado Historical Association Board of Directors, the Coronado Civil Service Commission, and the Bicycle Advisory Committee.

As a councilmember, he served on the city's Transborder Sewage Subcommittee, addressing cross-border sewage issues affecting Coronado's waters. Three council members confirmed his appointment and one voted against. He received the most votes in the November 5, 2024, general election (approximately 4,034 votes) and was elected as the 52nd mayor of Coronado.

His stated priorities have included addressing the Tijuana River sewage issue, city finances and infrastructure, public safety, and regional representation. Duncan sits on the board of San Diego Association of Governments (SANDAG).

In 2026, Duncan oversaw the city's logistical and safety response to NASCAR's inaugural race weekend at neighboring Naval Base Coronado, an event that drew an estimated 100,000 visitors to the area. He also participated in the event's pre-race ceremonies, serving as an honorary starter. He is also a member of the International Boundary and Water Commission (IBWC) Citizens Advisory Group and serves as a board alternate for the San Diego Metropolitan Transit System (MTS).

Personal life Duncan and his wife Peggy, also an attorney, have four children. He has been active in community service, including youth sports coaching and nonprofit boards.