Smarty
Zipcodestack
PostalDataPI
Geoco.io
Melissa Data Quality
Loqate
usZIPCodes.org
REST API for US ZIP, ZIP+4, and Canadian postal codes. Single unified endpoint covers address validation and standardization, radius search (centroid haversine and true spatial polygon intersection), point-to-point distance, autocomplete/typeah

Addoncrop
Plugins Addons Extensions
Opera Add-ons
Chrome Web Store
CRX4Chrome
Browser-extensions.club
extensions.af
Download Firefox extensions and themes. They’re like apps for your browser. They can block annoying ads, protect passwords, change browser appearance, and more.

Which is more popular?
Website, pricing, platforms and company facts side by side.
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ZIP
ZIP Code API
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|---|---|---|
| Website | zip-codes.com | addons.mozilla.org |
| Company | Startup from the United States · 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.

API for US ZIP, ZIP+4, and Canadian postal code data. One unified endpoint set covers North America — no separate APIs by country or data type. What it does Address validation and standardization — production-grade parser with ZIP+4 append, refreshed monthly Radius search — centroid haversine and...
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Extends the functionality of your web browser
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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Plugins Addons Extensions is a platform that provides a one-stop-shop for all the latest Chrome extensions that can help you to run your business.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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