POPULATION: 1,145,876

INCORPORATION DATE: 1850

BOARD OF SUPERVISORS:

• District 1 – John Gioia
• District 2 – Candace Andersen
• District 3 – Diane Burgis
• District 4 – Ken Carlson
• District 5 – Federal D. Glover

FORM OF GOVERNMENT: General Law

CONTRA COSTA. County seat, Martinez. Created February 18, 1850. The name signifies “opposite coast,” because of its situation opposite San Francisco, in an easterly direction, on San Francisco Bay. In 1853, Alameda County was formed from territory originally included in this county.