Data sources

Data compiled 2026-10-14. Counts: 41,637 ZIP codes (33,791 with Census ZCTAs), 412 area codes, 3,222 counties, 21,926 places.

Sources

• US Census Bureau Gazetteer Files 2024 (ZCTA, counties, places) — public domain
• US Census ZCTA-County relationship file 2020 — public domain
• GeoNames US postal codes — CC BY 4.0 (https://www.geonames.org)
• NumberResearch.org area codes (NANPA-derived) — CC BY 4.0
• Wikipedia List of NANP area codes — CC BY-SA (descriptions)
• IANA time zones via timezonefinder

Credits

• Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (table B01003, total population) for states, counties, places and ZCTAs.
• US Census Bureau data is public domain.
• Postal place names include GeoNames data (CC BY 4.0).
• Area code assignment data is derived from NANPA and redistributed via NumberResearch.org (CC BY 4.0). Some location descriptions and history text are adapted from Wikipedia (CC BY-SA 4.0).
• Maps: © OpenStreetMap contributors.
• Address ZIP+4 matching is provided by Geocodio using USPS data. ZipCodeBright is not a USPS Certified™ product.

ZIP vs ZCTA

ZIP codes are USPS delivery routes. ZCTAs are Census approximations. About 7,700 ZIPs (mostly PO-box-only or unique) have no ZCTA. We label those clearly and still show a best-effort location.