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Zip Code APIs

List of APIs that provide detailed information about Zip Codes.

The Top 10 Mapping & Maps APIs (for Developers in 2018)
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boundaries-io

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 programmatically for optimal performance.

Verified
✓
9.8
243 ms
100%
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RedLine Zipcode

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.

9.8
106 ms
100%
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Mexico ZIP Codes

Retrieve information of a zip code and search valid zip codes

9.3
162 ms
93%
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US Weather By Zip Code

Provides current weather information for US cities by zip code

Verified
✓
9
137 ms
100%
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Search Japanese PostCode

You can search address from zip code , or zip code from address in Japan. Use this API to find postcodes and detailed addresses from over 100,000 address information across Japan. Updated monthly with the latest data from Japan Post.

8.6
2,037 ms
100%
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Postcodes 4 U UK Address Finder

Search the Royal Mail PAF database for a list of addresses from a UK postcode or search for an address based on address id

8.7
149 ms
100%
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IP Address Geolocation

This API returns the location of an IP address (country, region, city, zipcode, latitude and longitude) and the associated timezone in JSON or XML format.

5.2
521 ms
100%
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Zippopotam.us

Zip Code Galore! Zip·po·pot·amus   /ˈzipōpätəməs/ Postal Codes and Zip Codes made easy Free API with JSON Response Format Over 60 Countries Supported Perfect for Form Autocompletion Open for Crowdsourcing and Contribution

2.4
181 ms
100%
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IP GEOLOCATION

Output Json format. Check location latitude and longitude, city name, country name, country code, isp name, region, zip code and more.

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UProc - Location by IP

Get location details by IPv4 address

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Zip-info

Get city,state, timezone, dst for a passed zip code

0.3
45 ms
0%
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LiveAddress - City-state-zip lookups

Look up US cities, states, and ZIP codes using this LiveAddress endpoint. Get ZIP codes for a city/state, and get cities/states for a ZIP code. Batch lookups supported.

About this Collection:

Zip Code APIs

About zip codes

Zip codes are a type of postal code used in the United States, created in the 1960s to make mail delivery faster and more efficient.

A standard zip code is a five-digit number, and today the US Postal Service uses a “ZIP+4” code, consisting of the zip code and an additional four-digit number for even more accuracy.

What is a zip code API?

Zip codes are very important for any website, app, or program that needs to look up or verify mailing addresses.

An API is a shortcut developers can use to connect their code to applications with existing zip code functionality.

How does a zip code API work?

Most zip code APIs work by gathering a specific zip code from an external program, either manually or via a map or other user interface, and performing some kind of operation on them. The results of the operation are then returned to the originating program, where they can be accessed by the end-user.

Who are zip code APIs for exactly?

Developers of software that delivers localized information to users can benefit from an API that delivers information about or based on zip codes.

Other users might include authors of mapping software, developers of a web-based storefront plugin for WordPress, and anyone else who needs to find information about a specific geographical area in the United States of America.

Why is a free zip code API important?

One important benefit of a free API is the cost.

However, free APIs are also important because they are likely to be written in as transparent a manner as possible. This makes it easy to connect other software to the functionality they provide, and also reduces research time.

What can you expect from zip code APIs?

APIs typically request information from external programs via GET or POST requests. They then return data in a JSON or XML format that can be accessed directly by the requesting program.

Are there examples of the best free zip code APIs?

  1. RedLine Zip code API (freemium) calculates distances and finds information about zip codes.
  2. LiveAddress API verifies data about cities, states, and zip codes.
  3. IP Address Geolocation API looks up IP addresses by zip code.
  4. US Weather by Zip API (freemium) provides up-to-date information about the weather in a zip code.
  5. Zippopotam.us is an open-source API with zip code information.

Zip Code API SDKs

All zip code APIs are supported and made available in multiple developer programming languages and SDKs including:

  1. Node.js
  2. PHP
  3. Python
  4. Ruby
  5. Objective-C
  6. Java (Android)
  7. C# (.NET)
  8. cURL

Just select your preference from any API endpoints page.

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