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

Apollo.io
Success.ai
Snov.io
B2B Rocket AI
folk.app
Attio
Reverse Contact
Make selling easy!

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 | zeliq.com |
| Pricing | — | |
| Company | Startup from the United States · 2026 | 2023 |
| 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...
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Apollo vs ZELIQ: Which is Better for Sales Prospecting?
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When comparing ZIP Code API and ZELIQ, 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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Apollo’s predictive prospecting, sales engagement, and actionable analytics help the teams to reach its full revenue potential.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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Achieve unmatched growth with Success.ai. Dive into 700M+ B2B leads and benefit from unlimited emails, automated warmups, and AI-powered writing.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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Snov.io is a multichannel lead generation and outreach automation platform that helps B2B teams find qualified leads, automate email and LinkedIn campaigns, and manage deals in one built-in CRM.
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