Free US ZIP code, place, area code and airport data — with JSON indexes
Reference data is easiest to use when it is both readable by humans and available as JSON. These free directories do both.US ZIP Codes — 17,759 ZIP codes with city, county, time zone and neighbouring ZIPs. Each page links to the places and area codes that overlap it.
US Places & Counties — 19,203 places and counties with 2023 Census population estimates, county assignment and the ZIP codes inside each place.
Area Codes — NANP area codes and world dialing codes, searchable by code, city, state or country.
Airport Codes — 10,181 airports with IATA and ICAO codes, runways, elevation and nearby airports.
For developers
Each site serves a compact JSON index under /data/ (for example /data/zips.json) that the search box loads once and filters locally. The datasets come from the US Census Bureau, GeoNames and OurAirports.
Everything is free, no sign-up: tekify.xyz.