Thornton, Colorado

1 ZIP code · Mountain time

ZIP codes (largest first)

80241 · 34,082
Population144,187
StateColorado
CountyAdams County
Time zoneMountain
Land area36.52 sq mi

Area codes in this area

303720983

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

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Population: U.S. Census Bureau, ACS 5-year estimates, 2024.