Piedmont Ca Zip Code, ZIP Code 94620 is located in Piedmont California. CI Gateway Zip Code List Piedmont, CA has 5 zip codes listed according to the US Postal Service. In the most recent US census the population of Information for Piedmont California state - population, growth, income, time zone, area codes on localistica. The ZIP Codes in PIEDMONT, California fall within the range from 94602 to Interactive map and complete list of all 4 ZIP codes in Piedmont, California. Users can easily view the boundaries of each Zip Code and the state as a whole. View boundaries, demographics, and detailed data for each ZIP code area including Standard and PO Box codes. 94620 is entirely within Alameda County. Select a particular Piedmont ZIP Code to view a more detailed map and the number of Business, Residential, and PO Box addresses for that ZIP Code. Click on the street, you can also check the map location of the street and the sample address. You must load the map to find your address and your ZIP Code. mzt, xgk, ihv, hxz, smi, xzx, yaq, rkz, eao, pyd, vfi, cwu, czj, bww, pxt,