We added an API to get results on a multiple zip codes API request:
Use this API to find out the city, state, latitude, longitude, and time zone information for multiple zip codes. The JSON and XML responses contain alternative acceptable city names for a location. Send a GET request to:
Each zip code provided counts as a separate request. For example, if you send 5 zip codes, you will be charged for 5 requests. Any zip code not found will not be included in the response.