
GovPredict
GovTrack.us
FiscalNote
LobbyUp
Track bills in every U.S. state + Congress — AI summaries, votes, campaign finance, and the bills that affect you.
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?
Website, pricing, platforms and company facts side by side.
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ZIP
ZIP Code API
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| Website | legis-track.com | zip-codes.com |
| Pricing | — | |
| Company | Startup from the United States · 1 - 9 employees · 2026 | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

LegisTrack is an AI-powered legislative tracking platform that lets you monitor bills across all 50 states and Congress, with real-time alerts, plain-language summaries, and professional reporting tools. Designed for advocates, analysts, and government affairs teams, it centralizes bill...
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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GovTrack.us enables users to track the bills and members of the United States Congress.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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FiscalNote is a GRM platform enabling government affairs professionals to maximize their influence on legislation.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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