Some websites that offer free ZIP code maps are ZipMap.net and UnitedStatesZipCodes.org. A ZIP code map separates each ZIP code area on a map with varying colors.
ZipMap.net and UnitedStatesZipCodes.org both provide a ZIP code map for the entire United States. On ZipMap.net, users click on a state of their choice on the home page and are taken to that state's specific ZIP code map. On UnitedStatesZipCodes.org, users are presented with a U.S. ZIP code map on the home page. On both websites, users either zoom in on a specific area on the map or type in a ZIP code number or address to find a desired location.
ZipMap.net also provides a list of county names on the state map page. By clicking on a county name, ZipMap.net presents a ZIP code map of that specific county.