Find the last 4 digits (ZIP+4) for an address in 81638

ZIP 81638, Hamilton, CO is filled in. Just type the street address.

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ZIP Code 81638 – Hamilton, CO

Hamilton, Colorado · Moffat County · Mountain time

ZIP code81638
CityHamilton
StateColorado
CountyMoffat CountyRoutt County
Population69
Time zoneMountain · local time
ZIP typeStandard (has a Census ZCTA area)
Land area418.11 sq mi
Center (lat, long)40.3004, -107.6427

Area codes in this area

970

These are the area codes that most often serve ZIP 81638 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

81626 Craig · 15.7 mi81641 Meeker · 16.1 mi81639 Hayden · 27.7 mi81625 Craig · 28.3 mi81633 Dinosaur · 43.9 mi81650 Rifle · 45.3 mi81637 Gypsum · 45.8 mi81653 Slater · 46.2 mi

About ZIP 81638

ZIP code 81638 is assigned to Hamilton, Colorado. It crosses 2 counties; most of its land is in Moffat County. Its Census area covers about 418.11 square miles of land. The closest neighboring ZIP is 81626 (Craig), about 15.7 miles away.

Every address in 81638 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources