US ZipCode
Validate and append data for any US ZipCode
- Authentication
- API Key
- HTTPS
- Yes
- CORS
- Yes
- Category
- Geocoding
- Data source
- public-apis + marcelscruz
- Documentation / URL
- https://www.smarty.com/docs/cloud/us-zipcode-api
Overview
Smarty’s US ZIP Code API returns ZIP-level data — city, state, and coordinates. Auth is Smarty auth-id + token (missing/invalid → 401, verified).
Quick Start
Lookup (replace your credentials):
curl "https://us-zipcode.api.smartystreets.com/lookup?auth-id=YOUR_ID&auth-token=YOUR_TOKEN&zipcode=90210"[
{
"zipcode": "90210",
"zipcode_type": "S",
"default_city": "Beverly Hills",
"county_fips": "06037",
"state": "CA",
"latitude": 34.09,
"longitude": -118.41
}
]Authentication
- Register at smarty.com → US ZIP Code API → auth-id + auth-token.
- Send as
auth-idandauth-tokenquery params (missing → 401, verified).
Rate Limits & Notes
- Free tier: 250 lookups/month (check the dashboard); paid plans scale.
- Lookup by
zipcodeorcity/state; returns county FIPS and coordinates.
FAQ
Is Smarty US ZIP Code free? Free tier: 250 lookups/month; more is paid.
How do I get credentials? smartystreets.com → create an account → auth-id/token.
Why 401?
auth-id/auth-token are required (verified).
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