Contra Costa County – 94509 – Antioch – CA – 16/35
Contra Costa County – 94509 – Antioch – CA – 16/35
Cities: Antioch, CA (81.35%), Pittsburg, CA (1.60%)
County: Contra Costa County, CA
Estimated zip code population in 2011: 61,266
Zip code population in 2010: 62,439
Zip code population in 2000: 90,879