Contra Costa County – 94596 – Walnut Creek – CA – 14/35
Contra Costa County – 94596 – Walnut Creek – CA – 14/35
Cities: Walnut Creek, CA (80.46%), Alamo, CA (0.06%), Waldon, CA (0.01%)
County: Contra Costa County, CA
Estimated zip code population in 2011: 19,869
Zip code population in 2010: 20,037
Zip code population in 2000: 40,916