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:

• Area codes for Denver and Colorado
• Area codes by town
• Lookup area codes
• Denver area code maps

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.

Lookup Denver phone numbers

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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

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 Check other map links below if this appears out of date.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

• WhitePages.com - USA & United States area code maps
• NANPA* - USA area codes search
• NANPA* - USA area code maps
• NANPA* - US national area code map (with time zone overlay)
• NANPA* - planned area code changes
• CNA* - Canada area codes map

* 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