Concord is the largest city in Contra Costa County

Contra Costa County, California

Contra Costa County is a primarily suburban county in the San Francisco Bay Area of the U.S. state of California. As of the 2010 census, it had a population of 1,049,025...

, California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

, USA

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. At the 2010 census, the city had a population of 122,067. Originally founded in 1869 as the community of Todos Santos by Salvio Pacheco, the name was changed to Concord within months. The city is a major regional suburban East Bay

East Bay (San Francisco Bay Area)

The East Bay is a commonly used, informal term for the lands on the eastern side of the San Francisco Bay, in the San Francisco Bay Area, in California, United States...

 center within the San Francisco Bay Area, and is located just 31 miles (50 km) east of San Francisco.
Concord is located at 37°58′41"N 122°01′52"W.