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, Upwork seems to be more popular. It has been mentioned 331 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 | upwork.com |
| Company | Startup from the United States · 2026 | Startup from the United States |
| 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 Upwork yet.
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Avoid Upwork! – Freelancers Beware: Upwork Review
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Upwork is one of the largest freelance marketplaces, offering a wide range of services across industries such as tech, writing, marketing, and design. Its reputation system allows employers to see past client reviews...
Upwork offers a staggering range of job categories, from writing and editing to web development, marketing, design, and even virtual assistance. This makes it a valuable resource for businesses with specific project...
✅ Upwork’s strengths, weaknesses, and issues;✅ What do websites like Upwork offer to compete against it (for example, Upwork time tracking);✅ Which Upwork competitors to turn to with your specific needs.
Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
Upwork: Great for beginners, wide variety of projects. - Source: dev.to / over 2 years ago
If you are learning web development, goto upwork.com and start doing projects. Your old projects & code is a lot more valuable than some references from a company. Source: almost 3 years ago
I just wanted to say, for anyone reading this far: this is the sort of thing you can hire a programmer to whip up for you to carry around on your phone. u/dark_rug just up and did it, but for anybody else finding themselves with a... Source: almost 3 years ago
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