There are 800 phone number prefixes within area code 303. Additionally, there are more than 8,000 phone numbers in this area code that have received at least one user report. The location of calls from area code 303 is Colorado, USA. Most numbers in this area code are in US Mountain time, where the time is currently 1:07:21 AM on May 9, 2025.
Choose a phone number from the list below to browse user reports for . You can also use the search box above to search for user reports about any phone number, or to file a report about any phone number.
| Prefix | City / State | Primary Telco |
|---|---|---|
| 303-500 | Hudson, CO | Level 3 Communications, Llc - Co |
| 303-501 | Denver, CO | Cellco Partnership Dba Verizon Wireless - Co |
| 303-502 | Fort Lupton, CO | Cellco Partnership Dba Verizon Wireless - Co |
| 303-503 | Denver, CO | Cellco Partnership Dba Verizon Wireless - Co |
| 303-504 | Denver, CO | Qwest Corporation |
| 303-505 | Denver, CO | Sprint Spectrum, L.p. |
| 303-506 | Fort Lupton, CO | New Cingular Wireless Pcs, Llc |
| 303-507 | Denver, CO | Sprint Spectrum, L.p. |
| 303-508 | Denver, CO | American Messaging Services, Llc |
| 303-509 | Denver, CO | American Messaging Services, Llc |
| 303-510 | Denver, CO | American Messaging Services, Llc |
| 303-511 | Colorado | |
| 303-512 | Denver, CO | Qwest Corporation |
| 303-513 | Denver, CO | New Cingular Wireless Pcs, Llc |
| 303-514 | Denver, CO | Cellco Partnership Dba Verizon Wireless - Co |
| 303-515 | Denver, CO | Onvoy, Llc - Co |
| 303-516 | Denver, CO | Qwest Corporation |
| 303-517 | Denver, CO | New Cingular Wireless Pcs, Llc |
| 303-518 | Denver, CO | Cellco Partnership Dba Verizon Wireless - Co |
| 303-519 | Denver, CO | Cellco Partnership Dba Verizon Wireless - Co |
| 303-520 | Denver, CO | Sprint Spectrum, L.p. |
| 303-521 | Denver, CO | Sprint Spectrum, L.p. |
| 303-522 | Denver, CO | Sprint Spectrum, L.p. |
| 303-523 | Denver, CO | T-mobile Usa, Inc. |
| 303-524 | Denver, CO | Teleport Communications America, Llc - Co |
| 303-525 | Denver, CO | Sprint Spectrum, L.p. |
| 303-526 | Denver, CO | Qwest Corporation |
| 303-527 | Denver, CO | Qwest Corporation |
| 303-528 | Denver, CO | American Messaging Services, Llc |
| 303-529 | Denver, CO | Onvoy, Llc - Co |
| 303-530 | Denver, CO | Qwest Corporation |
| 303-531 | Denver, CO | Mcimetro Access Transmission Services Llc |
| 303-532 | Longmont, CO | Mcleodusa Telecommunication Services, Inc. - Co |
| 303-533 | Denver, CO | Qwest Corporation |
| 303-534 | Denver, CO | Qwest Corporation |
| 303-535 | Fort Lupton, CO | Onvoy, Llc - Co |
| 303-536 | Hudson, CO | Qwest Corporation |
| 303-537 | Denver, CO | Teleport Communications America, Llc - Co |
| 303-538 | Denver, CO | Qwest Corporation |
| 303-539 | Denver, CO | Xo Colorado, Llc |
| 303-540 | Denver, CO | Usa Mobility Wireless, Inc. |
| 303-541 | Denver, CO | Qwest Corporation |
| 303-542 | Denver, CO | Mcimetro Access Transmission Services Llc |
| 303-543 | Denver, CO | Qwest Corporation |
| 303-544 | Denver, CO | Qwest Corporation |
| 303-545 | Denver, CO | Qwest Corporation |
| 303-546 | Denver, CO | Qwest Corporation |
| 303-547 | Denver, CO | Global Crossing Local Services, Inc. - Co |
| 303-548 | Denver, CO | Cellco Partnership Dba Verizon Wireless - Co |
| 303-549 | Denver, CO | Cellco Partnership Dba Verizon Wireless - Co |
| 303-550 | Denver, CO | Cellco Partnership Dba Verizon Wireless - Co |
| 303-551 | Denver, CO | Mcimetro Access Transmission Services Llc |
| 303-552 | Denver, CO | Global Crossing Local Services, Inc. - Co |
| 303-553 | Denver, CO | Usa Mobility Wireless, Inc. |
| 303-554 | Denver, CO | Qwest Corporation |
| 303-555 | Denver, CO | Qwest Corporation |
| 303-556 | Denver, CO | Qwest Corporation |
| 303-557 | Denver, CO | Global Crossing Local Services, Inc. - Co |
| 303-558 | Denver, CO | Global Crossing Local Services, Inc. - Co |
| 303-559 | Denver, CO | American Messaging Services, Llc |
| 303-560 | Denver, CO | Usa Mobility Wireless, Inc. |
| 303-561 | Denver, CO | Qwest Corporation |
| 303-562 | Denver, CO | Global Crossing Local Services, Inc. - Co |
| 303-563 | Denver, CO | Level 3 Communications, Llc - Co |
| 303-564 | Denver, CO | T-mobile Usa, Inc. |
| 303-565 | Denver, CO | Onvoy, Llc - Co |
| 303-566 | Denver, CO | Mcimetro Access Transmission Services Llc |
| 303-567 | Denver, CO | Qwest Corporation |
| 303-568 | Denver, CO | Teleport Communications America, Llc - Co |
| 303-569 | Georgetown, CO | Qwest Corporation |
| 303-570 | Denver, CO | New Cingular Wireless Pcs, Llc |
| 303-571 | Denver, CO | Qwest Corporation |
| 303-572 | Denver, CO | Qwest Corporation |
| 303-573 | Denver, CO | Qwest Corporation |
| 303-574 | Denver, CO | Qwest Corporation |
| 303-575 | Denver, CO | Qwest Corporation |
| 303-576 | Denver, CO | Qwest Corporation |
| 303-577 | Denver, CO | Electric Lightwave Llc Dba Allstream |
| 303-578 | Keenesburg, CO | Level 3 Communications, Llc - Co |
| 303-579 | Denver, CO | Cellco Partnership Dba Verizon Wireless - Co |
| 303-580 | Denver, CO | American Messaging Services, Llc |
| 303-581 | Denver, CO | Qwest Corporation |
| 303-582 | Denver, CO | Qwest Corporation |
| 303-583 | Denver, CO | Teleport Communications America, Llc - Co |
| 303-584 | Denver, CO | Qwest Corporation |
| 303-585 | Denver, CO | Qwest Corporation |
| 303-586 | Denver, CO | Level 3 Communications, Llc - Co |
| 303-587 | Denver, CO | Sprint Spectrum, L.p. |
| 303-588 | Denver, CO | New Cingular Wireless Pcs, Llc |
| 303-589 | Denver, CO | New Cingular Wireless Pcs, Llc |
| 303-590 | Denver, CO | Level 3 Communications, Llc - Co |
| 303-591 | Denver, CO | Sprint Spectrum, L.p. |
| 303-592 | Denver, CO | Qwest Corporation |
| 303-593 | Denver, CO | Teleport Communications America, Llc - Co |
| 303-594 | Denver, CO | Cellco Partnership Dba Verizon Wireless - Co |
| 303-595 | Denver, CO | Qwest Corporation |
| 303-596 | Denver, CO | Sprint Spectrum, L.p. |
| 303-597 | Denver, CO | Electric Lightwave Llc Dba Allstream |
| 303-598 | Denver, CO | Sprint Spectrum, L.p. |
| 303-599 | Denver, CO | Usa Mobility Wireless, Inc. |
April 28, 2025