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

Vote.org
ResistBot
Elevated Access
Outvote
Every Voice
Drive Turnout
Register to Vote
Send letters to voters π

Which is more popular?
Based on our record, Vote Forward seems to be more popular. It has been mentioned 86 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 | zip-codes.com | votefwd.org |
| Company | Startup from the United States Β· 2026 | β |
| 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 β no separate APIs by country or data type. What it does Address validation and standardization β production-grade parser with ZIP+4 append, refreshed monthly Radius search β centroid haversine and...
No description of Vote Forward yet.
What each product offers, as listed by its team.

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

Overall verdict
Why this product is good
Recommended for
No analysis of Vote Forward yet.
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2020 Year in Review | Vote Forward
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How often each product is chosen within a category, 0β100% relative to the other.

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

Tracking ZIP Code API since May 2026.
Letter writing campaigns here: https://votefwd.org/. Source: almost 3 years ago
Not completely on topic, but I wanted to share that I just wrote letters via Vote Forward (and had a letter writing party) for this election, if anyone wants to join in from not-in-Ohio! Source: over 3 years ago
If anyone is looking for a way to get involved and help defeat this, consider writing letters for vote forward: https://votefwd.org. Source: over 3 years ago
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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