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

GovPredict
GovTrack.us
FiscalNote
LobbyUp
Track bills in every U.S. state + Congress — AI summaries, votes, campaign finance, and the bills that affect you.

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 | zip-codes.com | legis-track.com |
| Pricing | — | |
| Company | Startup from the United States · 2026 | Startup from the United States · 1 - 9 employees · 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...
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...
What each product offers, as listed by its team.

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

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No analysis of LegisTrack yet.
How often each product is chosen within a category, 0–100% relative to the other.

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Research, analytics, and actionable intelligence for winning public affairs campaigns.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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GovTrack.us enables users to track the bills and members of the United States Congress.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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FiscalNote is a GRM platform enabling government affairs professionals to maximize their influence on legislation.
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