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Our Summer Appeal is underway. The Bookeye 4 Scanner Fund is now accepting donations. Visit our Support Us page!

The History Center will close at 2:00pm, Tues., April 23 so we may honor our volunteers with a special event.

2024 Annual Scholarship for High School Seniors Essay Contest - deadline April 30!

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!

See details

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.

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August 25, 2024

Author in the Archives Series, Beneath the Tangled Vines by Dan Hanel

January 27, 2024

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