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

Democracy.io by EFF
Vote Smart
Vote Forward
Ballotpedia
5 Calls
WhoAreMyRepresentatives
GovTrack.us
Civic engagement application.

Which is more popular?
Based on our record, ResistBot seems to be more popular. It has been mentioned 162 times since March 2021.
Website, pricing, platforms and company facts side by side.
|
ZIP
ZIP Code API
|
|
|
|---|---|---|
| Website | zip-codes.com | resist.bot |
| Company | Startup from the United States · 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...
No description of ResistBot 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 ResistBot yet.
Walkthroughs and reviews on video.
No ZIP Code API videos yet. You could help us improve this page by suggesting one.
SCAM ALERT ! Resistbot Reviews ! Text Rbg to 50409 Scam Know if is it SCAM or LEGIT? Resistbot Legit
More videos
How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using ZIP Code API and ResistBot. 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.
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
I discovered Resistbot a few years ago and have since contacted government representatives hundreds of times - it makes the process so easy. I do it through Facebook messenger. There's also a "trending" feature where I can see the... Source: almost 3 years ago
You can also use something like https://resist.bot to send messages to both at the same time. Source: almost 3 years ago
When comparing ZIP Code API and ResistBot, you can also consider the following products.

Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
Compare Smarty to ZIP Code API or ResistBot:

A simpler way to send messages to Congress
Compare Democracy.io by EFF to ZIP Code API or ResistBot:

Free Zip Code API - Free Postal Code Validation | Zipcodestack
Compare Zipcodestack to ZIP Code API or ResistBot:

Vote Smart, formerly called Project Vote Smart, is a non-profit, non-partisan research organization...
Compare Vote Smart to ZIP Code API or ResistBot:

The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
Compare PostalDataPI to ZIP Code API or ResistBot:
