The Most Reliable USA ZIP Code API for US Postal Data
Build store locators, delivery zones, and distance calculators with USPS-verified United States ZIP code data. Radius search, distance calculation, and smart autocomplete—all in one API for US addresses.
Free tier available • No credit card required
Get city and state information for a ZIP code
/api/zipcode/{zip}null100% United States Coverage
Our USA ZIP Code API provides comprehensive coverage of all US postal codes, including all 50 states, Washington DC, Puerto Rico, and US territories. USPS-verified and updated monthly for accuracy.
All 50 US States
Complete coverage of every state in the United States with accurate USPS data.
DC & Territories
Includes Washington DC, Puerto Rico, and all US territories for complete coverage.
USPS-Verified Only
US-only API focused exclusively on official USPS postal data for America.
Effortless Integration, Powerful Results
Start leveraging U.S. location data in your applications in just a few simple steps.
Get Your API Key
Sign up quickly on RapidAPI, subscribe to a plan (including free options!), and instantly receive your secure API access key.
Call API Endpoints
Use simple HTTP GET requests to our well-documented RESTful API endpoints from any application using your RapidAPI key.
Unlock US Location Insights
Receive structured JSON data and integrate valuable US location intelligence seamlessly into your projects.
Everything You Need for U.S. Location Data
Our USA ZIP Code API provides a comprehensive suite of tools to handle all your U.S. postal code needs with precision and speed.
USPS-Verified US Data
All US ZIP codes verified against official USPS standards. Updated monthly to ensure accuracy and compliance.
US ZIP Code Lookup
Instantly retrieve city, state, and other administrative details for any U.S. ZIP code.
US Radius Search
Find all US ZIP codes within a specified distance (miles/kilometers) of a target ZIP.
Distance Calculation
Accurately calculate the great-circle distance between two U.S. ZIP codes.
City & State to ZIPs
Get a list of all ZIP codes belonging to a specific U.S. city and state combination.
Lightning-Fast Performance
Optimized infrastructure delivers sub-100ms responses. Most queries complete in 30-80ms for exceptional speed.
Smart Autocomplete
Provide real-time US ZIP code and city suggestions to enhance user input forms.
Powering Diverse US Applications
From e-commerce to logistics, our USA ZIP Code API provides the backbone for a wide range of location-aware functionalities across the United States.
E-commerce & Retail
Enhance checkout with US address validation, calculate shipping zones, and power store locators.
Logistics & Delivery
Optimize US routes, define service areas, and estimate delivery times with precision.
Marketing & Sales Tech
Enable US geotargeting, manage sales territories, and enrich CRM data with location insights.
Business Intelligence
Augment datasets with US geographic information for market analysis and strategic planning.
SaaS & Mobile Apps
Integrate US location-based features, user verification, and content personalization.
Forms & User Input
Streamline data entry with US autocomplete and ensure accuracy of address information.
Clear, Comprehensive Documentation
We provide everything you need to get started quickly and integrate our USA ZIP Code API with ease. Explore our detailed API reference and test endpoints directly on RapidAPI.
| Endpoint Example | HTTP Method | Brief Description |
|---|---|---|
/api/zipcode/{zip} | GET | Get city/state for a US ZIP. |
/api/zipcodes/radius?zipcode=... | GET | Find US ZIPs in a radius. |
/api/distance?from=...&to=... | GET | Calc distance between two US ZIPs. |
/api/zipcodes/by-city?city=... | GET | List US ZIPs in a city/state. |
/api/zipcodes/autocomplete?q=... | GET | Suggest US ZIPs/cities. |
Got Questions? We Have Answers.
Here are some common questions about our U.S. ZIP Code API services.
What makes Payloadic different?
We provide USPS-verified US data updated monthly, ensuring high accuracy. Our optimized infrastructure delivers blazing-fast performance with sub-100ms response times, all easily accessible via RapidAPI.
Is this API only for the United States?
Yes, our ZIP Code API is exclusively for United States postal codes. It covers all 50 US states, Washington DC, Puerto Rico, and US territories with USPS-verified data.
Is there a free plan to test the API?
Yes! We offer a free tier on RapidAPI that allows you to make a generous number of requests so you can explore our features and integrate with confidence before committing.
How are the API endpoints secured?
All API requests must be made over HTTPS. Access is authenticated via your RapidAPI key, ensuring secure and validated requests.
What kind of support do you offer?
We offer comprehensive documentation on RapidAPI. For specific issues or plan-related queries, support is available through the RapidAPI platform.
How often is the US ZIP code data updated?
Our USA ZIP code database is updated monthly with the latest data from USPS to ensure you always have access to the most current and accurate US postal information.
Ready to Elevate Your US Application?
Join hundreds of developers and businesses leveraging precise U.S. location data. Get your API key and start building today!
Free tier available • No credit card required to test