List of Zipcodes in Walnut Creek, California; ZIP Code: ZIP Code Name: Population Its detail City, State, Plus 4, Population is as below. The average school expenditure in the U.S. is $12,383. About ZIP code 94597. Home appreciation the last 10 years has been 4.1%. It also has a slightly higher than average population density. There are 0 postal offices in zip code 94597 which we have listed below ZIP Code 5: 94598 - WALNUT CREEK, CA | California United States ZIP Code 5 Plus 4 ️ This is the 94598 full ZIP Code page list. 94597 Zip Code is part of the 209 area code. The following are the areas codes and zip codes for Walnut Creek, California ? SCHOOLS Walnut Creek (zip 94596) public schools spend $8,949 per student. 94597 Zip Code is spread between the coordinates of +37.777208 Latitude and -121.955399 Longitude. WALNUT CREEK Zip Code (CA) Walnut Creek is a city of Contra Costa, California in the Pacific West region of the USA. It is located about 58 miles south-southwest of CA's capital city of Sacramento. Zip Code Listing 94595 (area code: 925) 94596 (area code: 925) 94597 (area code: 925) 94598 (area code: 925) U.S. Zip Codes City of Walnut, CA - LOS ANGELES County California ZIP Codes. There are about 23.5 students per teacher in Walnut Creek (zip 94596). Map of ZIP Codes in Walnut Creek, California. Walnut Creek, CA Stats and Demographics for the 94598 ZIP Code. For your research we have also included Walnut Creek Area Code, Time Zone, UTC and the local Contra Costa County FIPS Code. Detailed information on every zip code in Walnut The median home cost in Walnut Creek (zip 94596) is $1,012,900. ZIP code 94598 is located in western California and covers a slightly less than average land area compared to other ZIP codes in the United States. Zip Code 94597 is located in Walnut Creek, Contra Costa county in the state of California. Check out the homes in the area. The people living in ZIP code 94598 are primarily white. Each Walnut Creek California zip code has a center Longitude / Latitude point (the Walnut Creek center is -122.06400299072 / 37.906299591064). Below is a list of Walnut Creek CA zip codes.