Look up any phone number starting with 303 to identify the owner name, address, spam reports, and more. The 303 area code is serving Denver and Boulder, as well as their surrounding suburbs, in the north-central portion of the U.S. state of Colorado.
Enter a full 10-digit number to identify the caller and whether it has been reported as spam.
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Phone numbers with the 303 area code prefix originate from the north-central portion of Colorado. This region specifically comprises the metropolitan areas of Denver and Boulder, along with their surrounding suburbs. It represents the primary numbering plan area for the state's Front Range, a densely populated region.
The 303 area code operates as part of an overlay complex with area codes 720 and 983 , serving the same geographic region. Area code 303 was the original area code for the entire state of Colorado, introduced in 1947, and later reduced in geographic extent. Area code 720 was added as an overlay on September 1, 1998, followed by area code 983, which was activated on June 17, 2022. Due to this overlay system, ten-digit dialing is required for all calls made within this service area.
Area code 303 is a general purpose code which was placed in service on January 1, 1947.
Our reverse phone lookup for Colorado analyzes the three-digit 303 area code to identify the initially assigned telecommunications company and rate center. This prefix code data may help to determine the U.S. carrier, Colorado geographic region, and local calling area associated with the phone number.
Phone numbers follow the following structure under the North American Numbering Plan:
Understanding the area code can help you determine if a call is local to your area. However, keep in mind that due to mobile number portability and VoIP services, the caller may be anywhere in the United States, so it’s best to search for the most recent phone number details.
| Company | Number of Prefixes |
|---|---|
| QWEST CORPORATION | 446 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO | 59 |
| LEVEL 3 COMMUNICATIONS, LLC - CO | 43 |
| T-MOBILE USA, INC. | 39 |
| NEW CINGULAR WIRELESS PCS, LLC | 35 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CO | 27 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 26 |
| USA MOBILITY WIRELESS, INC. | 16 |
| GLOBAL CROSSING LOCAL SERVICES, INC. - CO | 14 |
| ONVOY, LLC - CO | 12 |
| COMCAST IP PHONE, LLC | 7 |
| XO COLORADO, LLC | 4 |
| AMERICAN MESSAGING SERVICES, LLC | 3 |
| ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 3 |
| SELECTPATH OF COLORADO, INC. | 3 |
| BIJOU TEL. COOP. ASSN., INC. | 2 |
| COMMUNICATIONS UNLIMITED | 2 |
| LEVEL 3 TELECOM OF COLORADO, LLC - CO | 2 |
| EASTERN SLOPE RURAL TEL. ASSN., INC. | 1 |
| ELBERT COUNTY WIRELESS, LLC | 1 |
| ILOKA, INC. DBA NEWCLOUD NETWORKS - CO | 1 |
| INTERLINK ADV SVC DBA FORETHOUGHT.NET - CO | 1 |
| LIVE WIRE NETWORKS, INC. - CO | 1 |
| MCLEODUSA TELECOMMUNICATION SERVICES, INC. - CO | 1 |
| N.E. COLORADO CELLULAR, INC. | 1 |
| ONVOY SPECTRUM, LLC | 1 |
| ROGGEN TEL. COOP. CO. | 1 |
| SKYE TELECOM LLC DBA SKYETEL | 1 |
| STRASBURG TEL. CO. | 1 |
| YMAX COMMUNICATIONS CORP. - CO | 1 |
Carrier names have been updated from their original FCC assignments to reflect current companies following mergers, acquisitions, and rebranding. Updates were determined using AI-assisted research and may not be accurate or reflect up to date changes. This data is provided without warranties of accuracy or completeness.
| Rate Center | Number of Prefixes |
|---|---|
| DENVER | 706 |
| LONGMONT | 18 |
| FORTLUPTON | 11 |
| DECKERS | 5 |
| KEENESBURG | 3 |
| ALLNSPKLYN | 2 |
| DEER TRAIL | 2 |
| GEORGETOWN | 2 |
| HUDSON | 2 |
| BENNETT | 1 |
| BYERS | 1 |
| ROGGEN | 1 |
| STRASBURG | 1 |
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