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

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

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 | zip-codes.com | clerk.io |
| Pricing | — | |
| 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...
No description of Clerk yet.
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Share your experience with using ZIP Code API and Clerk. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
Try Clerk it’s a relatively cheaper alternative, very good for recommendations. Source: over 5 years ago
When comparing ZIP Code API and Clerk, you can also consider the following products.

Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
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Auth0 is a program for people to get authentication and authorization services for their own business use.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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PropelAuth hosts and manages your authentication.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
Compare PostalDataPI to ZIP Code API or Clerk:
