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Boulder County Area Codes

About Boulder County Area Codes

The county of Boulder County, located in Colorado, is served by 2 telephone area code(s) in this dataset. These calling codes cover cities, suburbs, and unincorporated communities across the county.

Major phone area codes used in Boulder County include 303, 720. The county mainly follows the America/Denver time zone.

Cities and towns served by these area codes in Boulder County include Boulder, Lafayette.

List of Area Codes in Boulder County, Colorado

The table below lists all telephone area codes used in Boulder County, Colorado, along with their associated cities and time zones from this dataset.


S.N. Area Code Cities Time Zone(s)
1 303 Boulder, Lafayette America/Denver
2 720 Boulder, Lafayette America/Denver


Related Area Code Pages

Explore related area code resources on Burning Compass:

  • All area codes in Colorado
  • Individual area code details are available from the table above.

County Area Codes in Colorado

  1. Adams County Area Codes
  2. Arapahoe County Area Codes
  3. Boulder County Area Codes
  4. Broomfield County Area Codes
  5. Denver County Area Codes
  6. Douglas County Area Codes
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  8. Jefferson County Area Codes
  9. Larimer County Area Codes
  10. Mesa County Area Codes
  11. Pueblo County Area Codes
  12. Weld County Area Codes

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