Area Codes for Denver, Colorado

The area codes used in the Denver metropolitan area are: 303, 720. See below for details.

In Denver, area codes are always included in written telephone numbers and area codes must be dialed for all calls, even for local calling. All United States phone numbers are 10-digits total, including a 3-digit area code and a 7-digit local subscriber number.

Denver area code information:

Denver area codes:
303, 720
more...

Area codes are used to route phone calls to a specific geographic area within a country. All area codes in the US are exactly 3-digits long.

In the past, a given region often had just one area code. Nowadays, many cities and towns in denser urban areas have 2 or more area codes.

To make an inbound international call (or domestic long distance call) to a Denver landline or mobile phone, you need to dial the appropriate 3-digit area code, followed by a 7-digit local subscriber number.

If you don't have a fully specified 10-digit phone number, including area code, you will not be able to complete an inbound call.

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Area Codes Used In & Near Denver, Colorado

The following table shows the area codes in use in the Denver metropolitan area and elsewhere in Colorado.

Denver Area Codes

Area Codes Main Locations
 303 
 720 
Covers the city of Denver, its suburbs, and other parts of north central Colorado, including Arvada, Aurora, Boulder, Brighton, Broomfield, Castle Rock, Castlewood, Columbine, Commerce City, Denver, Englewood, Highlands Ranch, Ken Caryl, Lafayette, Lakewood, Littleton, Longmont, Loveland, Northglenn, Parker, Southglenn, Thornton, Westminster, Wheat Ridge
 970  Covers locations in western and northern Colorado, including Aspen, Durango, Fort Collins, Grand Junction, Greeley, Loveland, Steamboat Springs, Vail
 719  Covers locations in central and southeastern Colorado, including Colorado Springs, Pueblo, Security-Widefield

See maps and other area code listings below for further information.

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Area Codes for Towns in Denver Area

The table below provides area codes for Denver and the largest nearby towns.

LocationArea Code(s)
Arvada CO area code 303 / 720
Aurora CO area code 303 / 720
Boulder CO area code 303 / 720
Brighton CO area code 303 / 720
Broomfield CO area code 303 / 720
Castle Rock CO area code 303 / 720
Castlewood CO area code 303 / 720
Columbine CO area code 303 / 720
Commerce City CO area code 303 / 720
Denver CO area code 303 / 720
Englewood CO area code 303 / 720
Highlands Ranch CO area code 303 / 720
Ken Caryl CO area code 303 / 720
Lafayette CO area code 303 / 720
Lakewood CO area code 303 / 720
Littleton CO area code 303 / 720
Longmont CO area code 303 / 720
Loveland CO area code 303 / 720
Northglenn CO area code 303 / 720
Parker CO area code 303 / 720
Southglenn CO area code 303 / 720
Thornton CO area code 303 / 720
Westminster CO area code 303 / 720
Wheat Ridge CO area code 303 / 720

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Lookup Denver Area Codes

To find the area codes (or ZIP codes) used in the Denver area, please use the WhitePages.com search widgets below. The first widget looks up area codes and ZIP codes by town. The second widget does reverse lookup by area code or ZIP code.

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Denver, Colorado Area Code Maps

The following map shows area codes for the Denver area.

Denver, Colorado Area Code Map

Denver, Colorado area code map

Source: WhitePages.com

Maps may not be completely up to date. Check other map links below if this appears out of date.

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City Codes vs. Area Codes

In some cases, area codes may be referred to as city codes. However, a 'city code' more correctly refers to the codes used to designate airports and other geographic locations. These codes are issued under the United Nation's UN/LOCODE system and/or the IATA airport coding system. The city code for Denver is DEN.

Other Area Code Information

* NANPA is the North American Numbering Plan Administrator. CNA is the Canadian Numbering Administrator. These are the official groups responsible for phone numbers in the US and Canada.

Denver online telephone directories
Denver dialing steps

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