Local Calling Guide
Area code/prefix search
NPA: 303
[Rate centres in NPA 303]
[Dial plan for NPA 303]
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| NPA-NXX |
BLOCK |
Rate Centre |
Region |
Switch |
OCN |
LATA |
LIR |
Eff date |
Disc date |
| 303-305
| 5 |
Denver |
CO |
DNVRCO37DS0 |
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
656 |
|
|
|
| 303-305
| 6 |
Denver |
CO |
DNVRCO37DS0 |
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
656 |
|
|
|
| 303-305
| 7 |
Denver |
CO |
DNVRCO37DS0 |
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
656 |
|
|
|
| 303-305
| 8 |
Denver |
CO |
DNVRCOII3MD |
6529 T-MOBILE USA, INC. |
656 |
|
2006-07-08 |
|
| 303-305
| 9 |
Denver |
CO |
DNVRCOMD4MD |
6010 NEW CINGULAR WIRELESS PCS, LLC |
656 |
|
2007-10-20 |
|
| 303-306
| A |
Denver |
CO |
DNVRCOSLDS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-306
| 0 |
Denver |
CO |
DNVRCOSLDS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-306
| 1 |
Denver |
CO |
DNVRCOSLDS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-306
| 2 |
Denver |
CO |
DNVRCOSLDS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-306
| 3 |
Denver |
CO |
DNVRCOSLDS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-306
| 4 |
Denver |
CO |
DNVRCOSLDS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-306
| 5 |
Denver |
CO |
DNVRCOSLDS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-306
| 6 |
Denver |
CO |
DNVRCOSLDS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-306
| 7 |
Denver |
CO |
DNVRCOSLDS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-306
| 8 |
Denver |
CO |
|
026D ONVOY, LLC - CO |
656 |
|
2008-08-29 |
|
| 303-306
| 9 |
Denver |
CO |
DNVRCOSLDS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-307
| A |
Denver |
CO |
DNVRCOMBDS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-308
| A |
Denver |
CO |
DNVRCOCPDS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-309
| A |
Denver |
CO |
|
6118 LEVEL 3 COMMUNICATIONS, LLC - CO |
656 |
|
|
|
| 303-309
| 0 |
Denver |
CO |
DNVTCO56DS8 |
6118 LEVEL 3 COMMUNICATIONS, LLC - CO |
656 |
|
2007-12-04 |
|
| 303-309
| 1 |
Denver |
CO |
DNVTCO56DS8 |
6118 LEVEL 3 COMMUNICATIONS, LLC - CO |
656 |
|
|
|
| 303-309
| 2 |
Denver |
CO |
DNVTCO56DS8 |
6118 LEVEL 3 COMMUNICATIONS, LLC - CO |
656 |
|
|
|
| 303-309
| 3 |
Denver |
CO |
DNVTCOZIDS1 |
026D ONVOY, LLC - CO |
656 |
|
2001-07-25 |
|
| 303-309
| 4 |
Denver |
CO |
DNVTCO56DS8 |
6118 LEVEL 3 COMMUNICATIONS, LLC - CO |
656 |
|
|
|
| 303-309
| 5 |
Denver |
CO |
|
6118 LEVEL 3 COMMUNICATIONS, LLC - CO |
656 |
|
|
|
| 303-309
| 6 |
Denver |
CO |
DNVTCOZIDS1 |
026D ONVOY, LLC - CO |
656 |
|
2003-09-13 |
|
| 303-309
| 7 |
Denver |
CO |
|
6118 LEVEL 3 COMMUNICATIONS, LLC - CO |
656 |
|
|
|
| 303-309
| 8 |
Denver |
CO |
DNVTCO56DS8 |
6118 LEVEL 3 COMMUNICATIONS, LLC - CO |
656 |
|
|
|
| 303-309
| 9 |
Denver |
CO |
|
6118 LEVEL 3 COMMUNICATIONS, LLC - CO |
656 |
|
|
|
| 303-310
| A |
Denver |
CO |
ENWDCOVF0MD |
9748 AMERICAN MESSAGING SERVICES, LLC |
656 |
|
|
|
| 303-312
| A |
Denver |
CO |
DNVRCOCPDS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-313
| A |
Denver |
CO |
DNVRCOCPDS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-314
| A |
Denver |
CO |
DNVRCOEADS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-314
| 0 |
Denver |
CO |
|
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-314
| 1 |
Denver |
CO |
|
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-314
| 2 |
Denver |
CO |
|
508J CENTURYLINK COMMUNICATIONS, LLC |
656 |
|
|
|
| 303-314
| 3 |
Denver |
CO |
|
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-314
| 4 |
Denver |
CO |
|
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-314
| 5 |
Denver |
CO |
|
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-314
| 6 |
Denver |
CO |
|
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-314
| 7 |
Denver |
CO |
|
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-314
| 8 |
Denver |
CO |
|
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-314
| 9 |
Denver |
CO |
|
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-315
| A |
Denver |
CO |
DNVRCOEADS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-316
| A |
Denver |
CO |
DNVRCOEADS0 |
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-316
| 0 |
Denver |
CO |
|
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-316
| 1 |
Denver |
CO |
|
732J NUSO, LLC |
656 |
|
2025-08-18 |
|
| 303-316
| 2 |
Denver |
CO |
|
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-316
| 3 |
Denver |
CO |
|
9636 QWEST CORPORATION |
656 |
|
|
|
| 303-316
| 4 |
Denver |
CO |
|
9636 QWEST CORPORATION |
656 |
|
|
|
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Last updated: Tue, 31 Mar 2026 13:56:49 UTC
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