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Thornton, CO ZIP Codes

Thornton, Colorado has 4 ZIP codes: 4 for street addresses (, , and ).

Your street decides which one you use.

Which Thornton ZIP code is my address in?

Street ranges from the Census Bureau, 2026. PO box and organization ZIP codes are not found by street. A new street may be missing: address not found?

Thornton ZIP code map

ZIP code map of Thornton, CO4 ZIP code areas in Thornton: 80229, 80233, 80241, 80602. Dashed line: Thornton city limits. Grey areas: neighboring towns.8060280229802338024180602802298023380241Commerce CityHendersonBroomfieldBrightonDenverErie80602802298023380241Commerce CityHendersonBroomfieldBrightonDenverErie

Tap or point to an area to see its ZIP code.Full-size map

Dashed line: Thornton city limits.

Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).

All Thornton ZIP codes by type

ZIPType and post office or station
80229street delivery; mail may be addressed to Denver
North Pecos
80233street delivery; mail may be addressed to Denver
Northglenn
80241street delivery
Northglenn
80602street delivery; mail may be addressed to Brighton
Brighton Carrier Annex

ZIP codes from nearby towns that reach into Thornton

  • 80023, mailing town Broomfield, covers 7 percent of Thornton
  • 80260, mailing town Denver, covers 6 percent of Thornton
  • 80640, mailing town Henderson, covers 2 percent of Thornton

Why your mail may say Thornton when you live outside it

Thornton ZIP codes also cover Todd Creek, Welby and Northglenn, so a letter addressed to Thornton can go to a home outside the city limits.

The reverse happens too: parts of Thornton use 80023, 80260 and 80640, which mail under a neighboring town's name.

A ZIP code does not set your city, school district or tax. Adams County property records show which city you are in.

Thornton ZIP code questions

What is the main ZIP code for Thornton?

80233, the ZIP code of the main Northglenn post office at 11887 Washington St.

What county is Thornton in?

Adams County.

ZIP codes for towns near Thornton

Northglenn, CO4 ZIP codes: 80233, 80234, 80260 and more · 2 milesBroomfield, CO5 ZIP codes: 80020, 80021, 80023 and more · 6 milesWestminster, CO6 ZIP codes: 80021, 80030, 80031 and more · 7 milesCommerce City, CO3 ZIP codes: 80022, 80640 and more · 8 milesBrighton, CO3 ZIP codes: 80601, 80602, 80603 · 8 milesErie, CO1 ZIP code: 80516 · 10 miles

More towns near Thornton: Lafayette, Denver, Arvada, Wheat Ridge, Boulder, Lakewood, Longmont, Englewood, Aurora.

Sources and last checked

USPS ZIP Locale Detail (October 1, 2026), GeoNames (CC BY 4.0), U.S. Census Bureau, HUD-USPS crosswalk.

Checked October 20, 2026. Sources · How we build our lists · Corrections