Contra Costa County
Contra Costa County was one of the original counties of California, created in 1850 at the time of statehood. The county was originally to be called Mt. Diablo County, but the name was changed prior to incorporation as a county. The county's Spanish language name means opposite coast, because of its location opposite San Francisco, in an easterly direction, on San Francisco Bay. Southern portions of the county's territory, including the all of the bayside portions opposite San Francisco, and Northern portions of Santa Clara County were given up to form Alameda County in 1853. - wikipedia.com
West County
Bayview-Montalvin
Kensington
Port Costa
Rollingwood
Tara Hills
(lists include incorporated and unincorporated)
Central County
Canyon
Diablo
Pacheco
Vine Hill
Waldon
