Walnut Creek, CA is a city located in Contra Costa County, California and has a land area of 35.95 square miles (93.11 km2). The water area for the city is 0.01 square miles or 0.03 km2. There are 4 total unique zip codes in Walnut Creek, California. The area code(s) for Walnut Creek is 341/510/925.
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