Colorado Area Code

The area code for Colorado refers to the numerical code assigned to a specific geographic region within the state of Colorado for telephone numbering purposes. Colorado has several area codes, and each one corresponds to a particular area or region within the state. Area codes are used in phone numbers to help route calls to the correct destination. Some of the area codes in Colorado include 303, 720, 719, and 970, among others, each covering different parts of the state.

State colorado
State Abbreviation: CO
State Nickname: Centennial State Equality State
Capital City Denver
Area Codes 303, 719, 720, 970
Timezone Mountain Time Zone (MT)
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What time zone is Colorado?

Colorado's primary time zone is Mountain Time (MT), typically UTC-7 during Standard Time and UTC-6 during Daylight Saving Time. Some western parts of the state may use Mountain Daylight Time (MDT) during DST. This variation is due to Colorado's geographic diversity and wide borders.

Note that the start and end dates of daylight saving time can change


Colorado's area code history includes the establishment of the original 303 area code in 1947, followed by the introduction of the 719 area code in 1988 to address the growing demand in the southern part of the state. In 1995, the 970 area code was added to serve the northern and western regions, and in 1998, the 720 area code was introduced as an overlay to the 303 area code, enabling new phone numbers to receive either code. These changes were essential to manage the state's burgeoning population and telecommunications needs efficiently.

All Area Codes in Colorado

This table provides a quick overview of all area codes, their locations, and some historical context for each.

Area Code Location History and Details
303 Denver Metro Area Covers the Denver metropolitan area and surrounding regions.
720 Overlay for 303 An overlay code serving the same regions as 303.
719 Southern Colorado Covers the southern part of the state, including cities like Colorado Springs and Pueblo.
970 Northern and Western Colorado Covers the northern and western regions of Colorado, including cities like Fort Collins and Grand Junction.

Largest Cities in Colorado with area codes

Quick overview of large cities, their area codes, and some historical context for each in colorado.

Name Area Code History and Details
Denver 303, 720 The capital and largest city of Colorado, known for its cultural scene and outdoor activities.
Colorado Springs 719 Located in southern Colorado, known for its natural beauty and proximity to Pikes Peak.
Aurora 303, 720 A diverse city adjacent to Denver, known for its cultural diversity and economic development.
Fort Collins 970 Home to Colorado State University and known for its lively downtown and outdoor recreation.
Lakewood 303, 720 A western suburb of Denver with a mix of residential and commercial areas.
Thornton 303, 720 Located in the northern Denver metropolitan area, known for its family-friendly neighborhoods.
Arvada 303, 720 A historic city with a small-town feel, located northwest of Denver.
Westminster 303, 720 Part of the Denver metropolitan area, known for its parks and recreational opportunities.
Pueblo 719 Located in southern Colorado, known for its steel industry and cultural heritage.
Boulder 303 Home to the University of Colorado Boulder and known for its progressive culture and outdoor activities.