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Zip Code API — Free Postal Code Search & Validation (zipcodestack.com)

Build with the Zip Code API from zipcodestack.com to validate postal codes, search global ZIP/postal codes, and calculate distances between areas. This document is optimized for developers looking for a fast, reliable, and free-tier friendly zip code API.

Links:

Get an API Key: zipcodestack.com
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Full API Documentation: zipcodestack.com/docs
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Overview
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Why This Zip Code API
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Quickstart
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Endpoints
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- Search Endpoint
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- Distance Endpoint
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Authentication
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Rate Limits & Quotas
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Usage Examples
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Use Cases
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FAQ Snapshot
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Support & Contact
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Overview

The zipcodestack Zip Code API provides real-time validation and information about global postal codes. With worldwide coverage and frequent updates, it’s ideal for address validation, checkout flows, and logistics distance calculations.

Reference: zipcodestack.com, API Docs

Why This Zip Code API

Global coverage with regularly updated data
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Easy-to-use REST API and SDKs
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Fast response times suitable for production
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Generous free tier to get started quickly
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Priority support and straightforward scaling options
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Quickstart

Sign up and get your API key: zipcodestack.com
Make your first request using your apikey header (or apikey query parameter).

Example (cURL):

curl -X GET \\\n  --url \"https://api.zipcodestack.com/v1/search?codes=20095&country=de\" \\\n  --header \"apikey: YOUR-APIKEY\"\n\n

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Search A Zip Code

This zip code search endpoint provides information about location information for the specified postal codes.

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Calculate Distances Between Zip Codes

This endpoint calculates the distance between a single zip code and one or more other zip codes.