Geocoding — entry 073 of 80
US ZipCode
Smarty's US ZIP Code API validates and enriches any US ZIP code — city/state, mailable status, county FIPS code, timezone, coordinate precision, and ZIP type (Standard, Military, P.O. Box, or Unique) — over an access-key-authenticated REST endpoint returning JSON. There's no permanent free tier for production use: Smarty sells prepaid lookup bundles (from roughly $0.60+ per 1,000 lookups pay-as-you-go) alongside a 42-day free trial and a free live demo on its site.
AuthenticationAPI KeySign up with the provider to obtain credentials.
HTTPSSupportedTraffic is encrypted in transit.
CORSEnabledCallable directly from browser JavaScript.
PricingMeteredBilled per request beyond a limited free quota.
FormatsJSONResponses can be requested as JSON.
GreatAPIs Score
Score55
Authentication15/25API key required
Pricing11/20Metered / usage-based pricing
Docs0/20No docs or spec available
Formats9/15Single response format
Freshness20/20Verified within 6 months
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<a href="https://greatapis.com/api/us-zipcode/"><img src="https://greatapis.com/badge/us-zipcode.svg" alt="Scored 55 on greatapis.com"></a>Auth quickstart
- Sign up with the provider to get an API key.
- Send it on every request as a header
Authorization: <key> - The exact header isn't documented — Authorization is a common default; confirm in the provider's docs.
Stored keyNo key stored
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.