The 303 area code is a telephone area code serving Denver and Boulder, as well as their surrounding suburbs, in the north-central portion of the U. To start a free reverse phone lookup, simply enter the full 10-digit number (including the 303 area code) below and access available caller information such as name, address, and more.
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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 will analyze the three-digit prefix of any 303 area code phone number and will show which telecommunications company and rate center it was initially assigned to. This prefix code data may help to determine the U.S. carrier, Colorado geographic region, and local calling area associated with the phone number.
| 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 |
| 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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