Contra Costa County – 94521 – Concord – CA – 5/35
Contra Costa County – 94521 – Concord – CA – 5/35
Cities: Concord, CA (64.33%), Walnut Creek, CA (0.62%), Clayton, CA (0.04%)
County: Contra Costa County, CA
Estimated zip code population in 2011: 41,880
Zip code population in 2010: 41,249
Zip code population in 2000: 39,887