Area code 303 is a telephone area code in the North American Numbering Plan (NANP) for the north-central portion of the U.S. state of Colorado. The numbering plan area comprises Denver and Boulder, as well as their surrounding suburbs, including Lakewood, Littleton, Longmont, Aurora, and Castle Rock.
Area code 303 was created in 1988 when it was split off from area code 303. At the time, it was one of the most complex splits in the nation. It was created to satisfy the growing need for phone numbers in the Denver/Boulder metropolitan area, which was experiencing a rapid population growth. The 303 area code is now one of the most populous area codes in the nation.
The 303 area code covers the Denver-Aurora-Boulder Combined Statistical Area, which is the 16th most populous Combined Statistical Area in the United States. The population of this area is estimated to be over 2.5 million people.
The 303 area code also covers portions of Adams, Arapahoe, Boulder, Denver, Douglas, and Jefferson counties in Colorado. It also covers a small portion of Carbon County, Wyoming.
History of Area Code 303
Area code 303 was created in 1988 as part of a split of the 303 area code. At the time, it was one of the most complex splits in the nation. The 303 area code covers the Denver-Aurora-Boulder Combined Statistical Area, which is the 16th most populous Combined Statistical Area in the United States.
Before the split, the 303 area code included all of Colorado. To accommodate the population growth in the Denver/Boulder metropolitan area, the 303 area code was split into two area codes. The 303 area code now covers the five-county Denver-Aurora-Boulder Combined Statistical Area. The remaining portions of Colorado are now served by the 720 area code.
Since its creation, the 303 area code has been one of the most populous area codes in the nation. The population of this area is estimated to be over 2.5 million people.
How to Dial a 303 Number
To call a phone number in the 303 area code, dial 1 + 303 + 7-digit phone number. To make an international call to a phone number in the 303 area code, dial 011 + 1 + 303 + 7-digit phone number.
What Cities are in 303 Area Code?
The 303 area code covers portions of Adams, Arapahoe, Boulder, Denver, Douglas, and Jefferson counties in Colorado. It also covers a small portion of Carbon County, Wyoming. Cities in the 303 area code include Denver, Boulder, Lakewood, Littleton, Longmont, Aurora, and Castle Rock.
Time Zone for 303 Area Code
The 303 area code is located in the Mountain Time Zone and observes daylight saving time.
Frequently Asked Questions
What is the area code for Denver, Colorado?
The area code for Denver, Colorado is 303.
What cities are in the 303 area code?
The 303 area code covers portions of Adams, Arapahoe, Boulder, Denver, Douglas, and Jefferson counties in Colorado. It also covers a small portion of Carbon County, Wyoming. Cities in the 303 area code include Denver, Boulder, Lakewood, Littleton, Longmont, Aurora, and Castle Rock.
Where is the 303 area code located?
The 303 area code is located in the north-central portion of the U.S. state of Colorado. The numbering plan area comprises Denver and Boulder, as well as their surrounding suburbs, including Lakewood, Littleton, Longmont, Aurora, and Castle Rock.
How do I call a phone number in the 303 area code?
To call a phone number in the 303 area code, dial 1 + 303 + 7-digit phone number. To make an international call to a phone number in the 303 area code, dial 011 + 1 + 303 + 7-digit phone number.
What time zone is the 303 area code in?
The 303 area code is located in the Mountain Time Zone and observes daylight saving time.
When was the 303 area code created?
The 303 area code was created in 1988 when it was split off from area code 303.
How many people live in the 303 area code?
The population of the 303 area code is estimated to be over 2.5 million people.
What is the Combined Statistical Area for the 303 area code?
The 303 area code covers the Denver-Aurora-Boulder Combined Statistical Area, which is the 16th most populous Combined Statistical Area in the United States.
What counties are in the 303 area code?
The 303 area code covers portions of Adams, Arapahoe, Boulder, Denver, Douglas, and Jefferson counties in Colorado. It also covers a small portion of Carbon County, Wyoming.
What states are in the 303 area code?
The 303 area code is located in the U.S. state of Colorado.
What is the NANP for the 303 area code?
The 303 area code is part of the North American Numbering Plan (NANP) for the north-central portion of the U.S. state of Colorado.
Is the 303 area code a toll-free number?
No, the 303 area code is not a toll-free number.
What other area codes are in Colorado?
The remaining portions of Colorado are now served by the 720 area code.