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SAVE THE DATE! January 27, 2024 CCCHS Annual Membership Meeting & Luncheon

Join us July 15 at the downtown Martinez Makers Market for book sales and a special silent auction. Free USGS maps available inside the History Ctr.

CCCHS seeks Executive Director. Visit our News page for details.

Join us Feb. 11 for the The History of the Joaquin Moraga Adobe!

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The Contra Costa County History Center will be closed December 17, 2023 thru January 1, 2024. We hope you have a wonderful holiday season!

Welcome to the Contra Costa County Historical Society

Exterior signage for the History Center.

Visit the History Center

A place where unique discoveries of the past are found every day. What will you find today?

Mt Diablo from Green & Stone Valley Roads, 1937

Research the Collection

Explore the vast collections found only at the Contra Costa County History Center.

Postcard of Southern Pacific Railroad Ferry 'Solano'  c1910

Contra Costa County History

Discover the history of Contra Costa County: its people, its places, its stories.

Contra Costa County Historical society awards Ezekiel Jenson

November 27, 2023

Contra Costa County Historical Society Announces Winners of Inaugural Essay Contest

January 27, 2024

CCCHS Annual Meeting and Luncheon, Balfour Guthrie. Brentwood. Boxed fruit.

Bookstore