
Auth0
PropelAuth
Descope
WorkOS
MikMak
AppWrite
Maropost Commerce Cloud
Clerk.io, the artificial intelligence for e-commerce that knows your customers interests.
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

Which is more popular?
Based on our record, Clerk seems to be more popular. It has been mentioned 1 time since March 2021.
Website, pricing, platforms and company facts side by side.
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ZIP
ZIP Code API
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| Website | clerk.io | zip-codes.com |
| Pricing | — | |
| Company | — | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of Clerk yet.
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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The Night Clerk - Movie Review - (No Spoilers)
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Recommendations tracked on public social media and blogs since March 2021.

Try Clerk it’s a relatively cheaper alternative, very good for recommendations. Source: over 5 years ago
Tracking ZIP Code API since May 2026.
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PropelAuth hosts and manages your authentication.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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