diff --git a/README.md b/README.md
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+++ b/README.md
@@ -343,6 +343,7 @@ This list is the result of Pull Requests, reviews, ideas and work done by 1100+
   * [Query.me](https://query.me) - Collaborative data notebooks that execute in a script-like fashion and allow to fetch and send data via SQL, API, and a growing number custom blocks, like Slack and Email. Free for small Teams.
 * [ERD Lab](https://www.erdlab.io) —  Free cloud based entity relationship diagram (ERD) tool made for developers.
 * [What The Diff](https://whatthediff.ai) - AI-powered code review assistant. The free plan has a limit of 25,000 tokens per month (~10 PRs).
+* [Zipcodestack](https://zipcodestack.com) - Free Zip Code API and Postal Code Validation. 10000 free requests/month.
 
 **[⬆️ Back to Top](#table-of-contents)**