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, ProtonVPN seems to be more popular. It has been mentioned 310 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 | protonvpn.com |
| Pricing | — | |
| Company | Startup from the United States · 2026 | Startup from Switzerland |
| 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 ProtonVPN 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 ProtonVPN yet.
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ProtonVPN Review 2019 - HONEST REVIEW!
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How often each product is chosen within a category, 0–100% relative to the other.

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Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
Try the free version of Proton VPN specifically. Source: almost 3 years ago
Hey there, after doing some research it seems like the conclusion is your vpn. Nord VPN has a lack of port forwarding, while other vpns have port forwarding (proton, mullvad). That is most likely interrupting your speed. also,... Source: almost 3 years ago
ProtonVPN - Secure and Free VPN (version 4.7.41.0): Free Swiss VPN with advanced security and privacy features. Source: about 3 years ago
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Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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Windscribe is a desktop application and browser extension that work together to block ads and trackers, restore access to blocked content and help you safeguard your privacy online.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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Mullvad is a Swedish virtual private network (VPN) provider.
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