Jefferson County Area Codes

About Jefferson County Area Codes

The county of Jefferson 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 Jefferson County include 303, 720. The county mainly follows the America/Denver time zone.

Cities and towns served by these area codes in Jefferson County include Arvada, Columbine, Ken Caryl, Lakewood, Littleton, Wheat Ridge.

List of Area Codes in Jefferson County, Colorado

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

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.