Contra Costa County – 94597 – Walnut Creek – CA – 34/35
Contra Costa County – 94597 – Walnut Creek – CA – 34/35
Cities: Walnut Creek, CA (74.06%), Waldon, CA (13.63%), Lafayette, CA (0.12%), Pleasant Hill, CA (0.07%), Concord, CA (0.02%)
County: Contra Costa County, CA
Estimated zip code population in 2011: 20,473