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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, Anchor CMS seems to be more popular. It has been mentioned 2 times 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 | anchorcms.com | zip-codes.com |
| Company | Startup from the United States | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of Anchor CMS 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...
What each product offers, as listed by its team.

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An editorial look at what each product does well and who it suits.

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Why this product is good
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How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using Anchor CMS and ZIP Code API. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

I'm running Anchor CMS and I just upgraded to version 0.8. When I try and run the installer I get a 'No input file specified' error. I believe it's more than likely a .htaccess problem but I'm not sure what the correct settings should be. Source: over 4 years ago
Nothing wrong with using WP as the platform for this. Alternatively you could try ClassicPress, Ghost or even Anchor. Source: over 5 years ago
Tracking ZIP Code API since May 2026.
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