The 720 area code is a dialing code in the North American Numbering Plan (NANP) assigned to the north-central part of Colorado State.
This area code is an overlay for the prefix 303, located in the same region. Both codifications surround 12 of the 64 Colorado counties; including Denver, Arapahoe, Jefferson, Boulder, and Adams.
As an overlay, the coverage radius of the 720 area code is mainly focused on the municipalities of Denver, Aurora, and Lakewood. However, it stretches for the whole region, being one of the most important codes of the state´s telephone network.
1. History
The main prefix of Colorado, the 303 area code started running in 1947, being one of the 86 original dialing numbers installed in the U.S. and Canada territories. Initially, this codification surrounded the entire state, becoming Colorado in one of the few states functioning with a single code.
The first split for the 303 area code was the dialing number 719, which arrived on March 5, 1988, 41 years after the activation of the 303.
During the late 20th century, the Denver territory and the whole state had a rapid growth that makes necessary the implementation of an overlay plan to solve the exhaustion conflict in the region. For that reason, on June 1, 1998, the 720 area code began serving in the zone, being the last codification activated in Colorado.
2. Location
Admitted on August 1, 1876, Colorado is the 38th state added to the union. This province lies in the Mountain West subregion of the Western United States bordering Utah to the west, Oklahoma and New Mexico to the south, Kansas to the east, and Nebraska to the North.
Encompassing a population of around 5.8 million inhabitants, Colorado is the 21st most populous of the 50 states. Besides, it appears as the 8th largest province surrounding a total area of 104,094 square miles.
Colorado is constituted of 64 counties and 271 incorporated municipalities, comprising 196 towns, 73 cities, and two consolidated city and county governments.
Located in the Mountain Time zone, the 720 area code covers 6697.11 square miles and possesses 209 non-unique postal area zip codes.
Adjacent codes
Colorado telephone network just contains four area codes for the entire state. The already mentioned codification 720 is the newest prefix added to the system in 1998.
The most used number in the zone is the 303 area code, which is also the oldest codification of the state; this dialing code serves nearly 2.9 million users that represent more than 50% of the population.
The rest of the area codes functioning in the region are the prefix 719, associated with Colorado Springs and its surrounding areas, and the number 970 designated to the north and western sections of the state; including Fort Collins, Greeley, Loveland, and Grand Junction.
3. Most Important Cities in the 720 Area Code
Denver
Denver is a County and city located in the South Platte River Valley on the western edge of the High Plains in Central Colorado. It represents the most populous County of the state and the 19th most populous city in the country encompassing over 749k inhabitants.
The consolidation of the city and County of Denver dates from December 1, 1902. This location stands out as the city-state capital and plays an important role in the agricultural industry of the High Plains region in Colorado. For this reason, Denver has been known historically as the “Queen City of the West”.
Defined by 78 official neighborhoods, Denver covers a total area of 154.92 square miles being the largest city in the state. Also, this global city symbolizes a key trade point and a commercial center for the country, incorporating some of the greatest companies of the U.S.
Covered by the 720 and 303 area codes, Denver encloses 71 non-unique ZIP codes.
Aurora
Situated in north-central Colorado, this city belongs to Adams, Arapahoe, and Douglas counties. Aurora is one of the main municipalities of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area; covering a total area of 159.70 square miles.
Incorporated in 1929, Aurora is the third-most populous city of Colorado and the 54th most populated in the country, with an estimated population of 388k residents.
This city officially manages more than 100 parks and 27 historic sides and landmarks, including the Aurora Fox Theatre & Arts Center, the Gully Homestead, and the Aurora History Museum, among others.
Aurora’s postal service is constituted by 18 non-unique ZIP codes.
4. Other Important Locations and ZIP Codes of the 720 Area Code
The 720 area code covers Denver other 11 counties in Colorado including:
- Arapahoe County: Arapahoe is the third-most populous county of Colorado State, with around 666k people. Forming part of the Denver-Aurora-Lakewood metropolitan statistical area; its largest city is Aurora and the county seat is the municipality of Littleton. Covering a total area of 805 square miles this county possesses 30 ZIP codes.
- Jefferson County: Founded on November 1, 1861, and named by Thomas Jefferson, this county has a population of over 589k inhabitants, being the 4th most populous of the state. Known as the “Gateway of the Rocky Mountains”, Jefferson is home to the state-supported Colorado School of Mines and owns 35 ZIP codes.
- Adams County: also situated in Denver–Aurora–Lakewood, CO Metropolitan Statistical Area, Adams’ Foundation dates from April 15, 1901. With a population estimated at 529k people, this county covers a total area of 1,184 square miles and encloses 24 ZIP codes.
- Boulder County: surrounding 740 square miles, this county is home to the “Colorado Chautauqua National Historic District”. Its county seat and the most populous city is the municipality of Boulder and divides its postal service into 26 ZIP codes.
Main Postal and Shipping Services
- US Post Office – CPU, Littleton, CO - +1 720-922-3680
- Mail Xpress, Commerce City, CO, - +1 720-600-0807
- The UPS Store, Foxfield, CO, - +1 720-870-5829
5. FAQs
How many area codes are there in Denver?
The principal County and city of Colorado possesses 2 of the four area codes of the state; they are the dialing numbers 303 and 720.
What is the original area code of Colorado?
The original prefix of Colorado is the 303 area code, which is also the most employed in the region.