Zipcodebase is a zip code API that was founded in 2019 to solve common issues with postal code data. As we have launched geocodeapi.io, a general geocoding API for forward and reverse geocoding, we learned from our customers, that that there was a specific need for zip code data. Our customers were basically looking for a simple solution to do tasks:

• calculate the distance between zip codes
• find zip codes around a given zip code
• find a major location behind a zip code
• match together a list of zip codes by their distance to each other

This was the moment we decided to launch zipcodebase.com, a feature-complete zip code API.

The API uses keys to allow access to the API. You can register a free API key at our developer portal. This will allow you to conduct 10,000 free searches per month.

To provide you with the best developer experience possible, we also created a Postman collection covering all of our endpoints.

(All links can be copied to your browser for testing, simply replace "YOUR-APIKEY", with your personal key)

This endpoint allows you to receive information for one or multiple given postal codes.

https://app.zipcodebase.com/api/v1/search?apikey=YOUR-APIKEY&codes=10005%2C51503

This endpoint allows you to calculate the distance between one and another (or multiple) postal codes.

https://app.zipcodebase.com/api/v1/distance?apikey=YOUR-APIKEY&code=10005&compare=10006%2C10007&country=us

This endpoint will convert a list of submitted postal codes into a list of postal code pairs that are located within a given distance to each other.

https://app.zipcodebase.com/api/v1/radius?apikey=YOUR-APIKEY&code=10005&radius=100&country=us

This endpoint returns a list of postal code pairs that are within a given distance to each other.

https://app.zipcodebase.com/api/v1/match?apikey=YOUR-APIKEY&codes=10005%2C10006%2C10009%2C90001&distance=100&country=us

This endpoint returns a list of postal codes based on a city.

https://app.zipcodebase.com/api/v1/code/city?apikey=YOUR-APIKEY&city=New%20York&state_code=NY&country=us

This endpoint returns a list of postal codes based on a state.

https://app.zipcodebase.com/api/v1/code/state?apikey=YOUR-APIKEY&state_code=NY&country=us

Our full documentation can be found here: https://app.zipcodebase.com

Do not hesitate to contact our support team that will help to get you started.

The use of zipcodebase API is subject to our terms & conditions.