The Zip Code API provides the following functions: Distance Between Zip Code API - The API allows you to quickly and easily figure out the distance between zip codes. Zip Codes in Radius API - You can use this API to find all zip codes within a given radius from another zip code. Zip Code to City and State API and Zip Code to Latitude/Longitude API - The API can convert a zip code to the primary location for the zip code. This includes the city, state, latitude, and longitude for the primary location. City to Zip Code - This API looks up the Zip Code based on the City and State.
US Zipcode, County, City, and State Boundaries API: A simple & very fast API that will allow you to integrate multiple GeoJson US boundaries results into your apps and systems. This API is designed to be used programatically for optimal performance. When using the MashApe UI for queries expect significant latency issues on large result sets!