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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?
Website, pricing, platforms and company facts side by side.
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ZIP
ZIP Code API
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| Website | monarchapis.com | zip-codes.com |
| Company | Startup from the United States | Startup from the United States ยท 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of Monarch yet.
API for US ZIP, ZIP+4, and Canadian postal code data. One unified endpoint set covers North America โ no separate APIs by country or data type. What it does Address validation and standardization โ production-grade parser with ZIP+4 append, refreshed monthly Radius search โ centroid haversine and...
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Researchers, bioinformaticians, and developers working in genomics, proteomics, and other biological data fields who require extensive, reliable data resources and user-friendly analysis tools.
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Best for: Couples who want a shared wealth-tracking dashboard and don't need disciplined budget execution. If it's down to Monarch and one other app, we've refereed the big matchups: YNAB vs Monarch and Copilot vs...
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