US ZipCode
Free trialLiveLast verified 24 Sept 2026
Looks up US ZIP Codes from city/state, or city/state from a ZIP Code, via USPS-based data.
Example request
curl -s 'https://us-zipcode.api.smarty.com/lookup?auth-id=$API_KEY&auth-token=$API_SECRET&city=mountain+view&state=CA&zipcode=94035'
Free tier, in plain English
A 42-day trial with 1,000 lookups, no card needed. After that, usage requires a paid annual subscription.
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