A free US ZIP code API (city, county, time zone, radius, distance)

Updated 2026-10-17 · Data and API builders · by CyberMax

Short answer

Call Ziplore with a 5-digit ZIP to get city, state, county FIPS code, coordinates, time zone and (optionally) ACS demographics, all from public-domain Census data. It also answers nearest-ZIP, radius and distance questions. The free tier is 200 calls a day without a key.

Copy-paste code

Common lookups

curl "https://ziplore.cybermaxtools.com/v1/zip/10001"
curl "https://ziplore.cybermaxtools.com/v1/zip/10001?demographics=1"
curl "https://ziplore.cybermaxtools.com/v1/radius?zip=60601&miles=10"
curl "https://ziplore.cybermaxtools.com/v1/distance?from=94105&to=10001"

Good to know

ZIP codes are USPS delivery routes, not areas; Census ZCTAs approximate them. That is why a ZIP can span two counties; the API returns the main one.

Ziplore API: US ZIP codes to county, time zone and demographics

from $5

Ziplore answers ZIP lookups, radius search, nearest ZIP and distance in milliseconds at the edge, from public-domain Census data. Free: 200 calls a day.

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Questions

Is the data free to use commercially?

Census data is public domain; the API's free tier is for anyone, paid plans add volume.

How do I get the time zone for a ZIP?

It is in every /v1/zip response.

Free: the Free API Starter Kit

Copy-paste calls for 4 APIs with free daily tiers (CVE priority, VIN recalls, US duty rates, email checks), then 5 short emails on KEV/EPSS, MCP and free data.