USPS-Verified Data • Updated Sep 2025

The Most Reliable US Zip Code & Radius API for Developers

Build store locators, delivery zones, and distance calculators with USPS-verified ZIP code data. Radius search, distance calculation, and smart autocomplete—all in one API.

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{
  "success": true,
  "found": true,
  "data": {
    "originZipcode": "90210",
    "radius": 5,
    "unit": "mi",
    "zipcodes": [
      {
        "city": "Beverly Hills",
        "zipcode": "90212",
        "distance": 1.75
      },
      {
        "city": "Los Angeles",
        "zipcode": "90046",
        "distance": 3.41
      },
      {
        "city": "West Hollywood",
        "zipcode": "90069",
        "distance": 2.9
      }
    ]
  }
}

Effortless Integration, Powerful Results

Start leveraging U.S. location data in your applications in just a few simple steps.

1. Get Your API Key

Sign up quickly on RapidAPI, subscribe to a plan (including free options!), and instantly receive your secure API access key.

2. Call API Endpoints

Use simple HTTP GET requests to our well-documented RESTful API endpoints from any application using your RapidAPI key.

3. Unlock Location Insights

Receive structured JSON data and integrate valuable location intelligence seamlessly into your projects.

Everything You Need for U.S. Location Data

Our API provides a comprehensive suite of tools to handle all your U.S. postal code needs with precision and speed.

✅

USPS-Verified Data

All ZIP codes verified against official USPS standards. Updated monthly to ensure accuracy and compliance.

🔍

ZIP Code Lookup

Instantly retrieve city, state, and other administrative details for any U.S. ZIP code.

📍

Radius Search

Find all 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 ZIP code and city suggestions to enhance user input forms.

Powering Diverse Applications

From e-commerce to logistics, our API provides the backbone for a wide range of location-aware functionalities.

🛒 E-commerce & Retail

Enhance checkout with address validation, calculate shipping zones, and power store locators.

🚚 Logistics & Delivery

Optimize routes, define service areas, and estimate delivery times with precision.

🎯 Marketing & Sales Tech

Enable geotargeting, manage sales territories, and enrich CRM data with location insights.

📊 Business Intelligence

Augment datasets with geographic information for market analysis and strategic planning.

📱 SaaS & Mobile Apps

Integrate location-based features, user verification, and content personalization.

📝 Forms & User Input

Streamline data entry with autocomplete and ensure accuracy of address information.

Clear, Comprehensive Documentation

We provide everything you need to get started quickly and integrate our 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 ZIP.
`/api/zipcodes/radius?zipcode=...`	GET	Find ZIPs in a radius.
`/api/distance?from=...&to=...`	GET	Calc distance between two ZIPs.
`/api/zipcodes/by-city?city=...`	GET	List ZIPs in a city/state.
`/api/zipcodes/autocomplete?q=...`	GET	Suggest ZIPs/cities.

View Full API Docs on RapidAPI

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 data updated monthly, ensuring high accuracy. Our optimized infrastructure delivers blazing-fast performance with sub-100ms response times, all easily accessible via RapidAPI.

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.

Ready to Elevate Your Application?

Join hundreds of developers and businesses leveraging precise U.S. location data. Get your API key via RapidAPI and start building today!

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