Contra Costa refers to Contra Costa County, California and many things within or adjacent to its borders, including:
Population centers
Contra Costa Centre, California
Transit
Contra Costa (railroad ferryboat)
Pleasant Hill/Contra Costa Centre station
Alameda-Contra Costa Transit District
Eastern Contra Costa Transit Authority
Western Contra Costa Transit Authority
Water
Contra Costa Canal
Contra Costa Water District
Schools
Contra Costa Community College District
Contra Costa College
West Contra Costa Unified School District
Other governmental bodies
Arts and Culture Commission of Contra Costa County
Contra Costa County Board of Supervisors
Contra Costa County Employees' Retirement Association
Contra Costa County Library
Contra Costa County Superior Court
Central Contra Costa Sanitary District
West Contra Costa County Detention Center
Newspaper
Contra Costa Times
Related lists
California Historical Landmarks in Contra Costa County
National Register of Historic Places listings in Contra Costa County, California