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Celebrate American Archives Month with CCCHS, October 19 at our Open House, 10am-3pm

Dan Hanel's Beneath the Tangled Vines on August 25th is SOLD OUT. We are taking a waiting list.

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.

July 29, 2024

Contra Costa County Historical Society Announces Winners of the 2024 Essay Contest

American Archives Month logo courtesy of the Society of American Archivists

October 19, 2024

Open House at the History Center in celebration of American Archives Month

August 25, 2024

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

Bookstore