
ResistBot
Call To Action
Every Voice
Call Your Reps
WhoAreMyRepresentatives
5 Calls
Worldle
A simpler way to send messages to Congress
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?
Based on our record, Democracy.io by EFF seems to be more popular. It has been mentioned 34 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 | democracy.io | zip-codes.com |
| Company | — | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of Democracy.io by EFF yet.
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.

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

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Overall verdict
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Recommended for
How often each product is chosen within a category, 0–100% relative to the other.

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

Contact your representative and two senators using Resistbot, Democracy.io, or manually. And ask other people to do so as well. Sure, it’s minuscule, but that’s the main tool we’ve got afaik. Source: almost 3 years ago
In addition to contacting Warner's office, contact your specific representatives in the House and Senate. Check out https://democracy.io for a quick and easy way to contact all them at once. Source: over 3 years ago
Check https://democracy.io for an easy way to contact your representatives. I also just found this: Casework@gillibrand.senate.gov. Source: over 3 years ago
Tracking ZIP Code API since May 2026.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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