M
API Matrix

ZipCodeAPI API

Geocoding / API Key Intermediate HTTPS
Varies by plan (check documentation)
72 Score
Grade B
Visit Official Site Compare Alternatives

Overview

ZipCodeAPI provides US zip code data including distances between zip codes, all zip codes within a given radius, and city and state lookups. It is useful for building delivery range calculators, store locators, or any app that needs to work with US postal geography. A free tier allows a limited number of requests per day.

💡

Beginner Tip

The distance endpoint returns miles by default; add units=km to switch to kilometers. Always cache results for frequently queried zip codes to stay within your daily request quota.

Available Data

IP address information
geographic location
ASN and ISP data

Example Response

JSON Response 
{
  "status": "success",
  "data": {
    "result": "Data from ZipCodeAPI",
    "description": "US zip code distance, radius and location API",
    "timestamp": "2025-01-15T10:00:00Z"
  }
}

Field Reference

zip_code The queried 5-digit US zip code.
lat Latitude coordinate of the zip code centroid.
lng Longitude coordinate of the zip code centroid.
city Primary city name for the zip code.
state Two-letter state abbreviation for the zip code.
timezone.timezone_identifier IANA timezone string for the zip code area, e.g. America/Los_Angeles.

Implementation Example 

const url = "https://www.zipcodeapi.com/";
// Replace headers or query params with the values required by this API.
const response = await fetch(url, {
  headers: {
  "X-API-Key": "YOUR_API_KEY"
  }
});
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

What Can You Build?

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

Common Errors & Troubleshooting

403 Forbidden Invalid or expired API key.
✓ Register at zipcodeapi.com and use the API key shown in your dashboard as the third path segment in the URL.
404 Not Found The zip code does not exist in the database.
✓ Verify the zip code is a valid 5-digit US postal code. Puerto Rico and US territories may not be included.
429 Too Many Requests Daily request limit exceeded on the free plan.
✓ Cache common zip code lookups locally or upgrade to a paid plan for higher limits.

Matrix Score Breakdown

🌐 Reachability 30/30
⚡ Speed 5/20
🔒 Security 15/15
🛠 Developer XP 12/20
✓ Reliability 10/15

Partially tested on Apr 5, 2026

Technical Specifications

Auth API Key
HTTPS REQUIRED
CORS UNKNOWN
Category Geocoding
Difficulty Intermediate
Verified: 2026-04-04

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