Contra Costa County is a county in the state of California.
It is in the United States. As of the 2020 census, the population was 1,165,927. The county seat is Martinez. It is in the eastern part of the San Francisco Bay Area region.
This article uses material from the Wikipedia Simple English article Contra Costa County, California, which is released under the Creative Commons Attribution-ShareAlike 3.0 license ("CC BY-SA 3.0"); additional terms may apply (view authors). Content is available under CC BY-SA 4.0 unless otherwise noted. Images, videos and audio are available under their respective licenses.
®Wikipedia is a registered trademark of the Wiki Foundation, Inc. Wiki Simple English (DUHOCTRUNGQUOC.VN) is an independent company and has no affiliation with Wiki Foundation.