The 303 Area Code (or Area Code 303) is located in the state of CO. Area Code 303 is one of the 269 3-digit telephone area codes in the USA. It covers roughly 3.1 million unique phone numbers and 10.9 million individuals near the city of Denver
Area code 303 was put into service. In 1988 Area code 303 was split to form area code 719. In 1995 area code 303 was split to form area code 970. In 1998 area code 303 was overlaid with area code 720.
Allenspark, Aurora, Bennett, Brighton, Byers, Deer Trail, Denver, Englewood, Fort Lupton, Golden, Hudson, Idaho Springs, Keenesburg, Littleton, Longmont, Louisville, Lyons, Roggen, Sedalia, Strasburg.
| PREFIX | COUNTY | CITY | CARRIER | TYPE |
|---|---|---|---|---|
| 303-556 | Denver | Denver | Qwest Corporation | Landline |
| 303-557 | Denver | Denver | Global Crossing Local Services, Inc.-Co | Landline |
| 303-558 | Denver | Denver | Global Crossing Local Services, Inc.-Co | Landline |
| 303-559 | Denver | Denver | American Messaging Services, Llc | Wireless |
| 303-560 | Denver | Denver | Usa Mobility Wireless, Inc. | Wireless |
| 303-561 | Denver | Denver | Qwest Corporation | Landline |
| 303-562 | Denver | Denver | Global Crossing Local Services, Inc.-Co | Landline |
| 303-563 | Denver | Denver | Icg Telecom Group - CO | Landline |
| 303-564 | Denver | Denver | T-Mobile Usa, Inc. | Wireless |
| 303-565 | Denver | Denver | Cbeyond Communications, Llc - CO | Landline |
| 303-566 | Denver | Denver | Mcimetro Access Transmission Services Llc | Landline |
| 303-567 | Denver | Denver | Qwest Corporation | Landline |
| 303-568 | Arapahoe | Aurora | Teleport Communications America, Llc - CO | Landline |
| 303-569 | Clear Creek | Georgetown | Qwest Corporation | Landline |
| 303-570 | Denver | Denver | New Cingular Wireless Pcs, Llc | Wireless |
| 303-571 | Denver | Denver | Qwest Corporation | Landline |
| 303-572 | Denver | Denver | Qwest Corporation | Landline |
| 303-573 | Denver | Denver | Qwest Corporation | Landline |
| 303-574 | Denver | Denver | Qwest Corporation | Landline |
| 303-575 | Denver | Denver | Qwest Corporation | Landline |
| 303-576 | Denver | Denver | Qwest Corporation | Landline |
| 303-577 | Denver | Denver | Eschelon Telecom Of Colorado, Inc. - CO | Landline |
| 303-578 | Denver | Denver | Level 3 Communications, Llc - CO | Landline |
| 303-579 | Denver | Denver | Cellco Partnership Dba Verizon Wireless - CO | Wireless |
| 303-580 | Denver | Denver | American Messaging Services, Llc | Wireless |
| 303-581 | Denver | Denver | ||
| 303-582 | Gilpin | Central City | Qwest Corporation | Landline |
| 303-583 | Denver | Denver | Teleport Communications America, Llc - CO | Landline |
| 303-584 | Denver | Denver | Qwest Corporation | Landline |
| 303-585 | Denver | Denver | Qwest Corporation | Landline |
| 303-586 | Denver | Denver | 4Dvision, Llc - CO | Landline |
| 303-587 | Denver | Denver | Sprint Spectrum L.p. | Wireless |
| 303-588 | Denver | Denver | New Cingular Wireless Pcs, Llc | Wireless |
| 303-589 | Denver | Denver | New Cingular Wireless Pcs, Llc | Wireless |
| 303-590 | Denver | Denver | Icg Telecom Group - CO | Landline |
| 303-591 | Denver | Denver | Sprint Spectrum L.p. | Wireless |
| 303-592 | Denver | Denver | Qwest Corporation | Landline |
| 303-593 | Denver | Denver | Teleport Communications America, Llc - CO | Landline |
| 303-594 | Arapahoe | Englewood | Cellco Partnership Dba Verizon Wireless - CO | Wireless |
| 303-595 | Denver | Denver | Qwest Corporation | Landline |
| 303-596 | Arapahoe | Englewood | Sprint Spectrum L.p. | Wireless |
| 303-597 | Denver | Denver | Eschelon Telecom Of Colorado, Inc. - CO | Landline |
| 303-598 | Arapahoe | Englewood | Sprint Spectrum L.p. | Wireless |
| 303-599 | Denver | Denver | Usa Mobility Wireless, Inc. | Wireless |
| 303-600 | Arapahoe | Aurora | Teleport Communications America, Llc - CO | Landline |
| 303-601 | Denver | Denver | New Cingular Wireless Pcs, Llc | Wireless |
| 303-602 | Denver | Denver | Qwest Corporation | Landline |
| 303-603 | Denver | Denver | Qwest Corporation | Landline |
| 303-604 | Boulder | Lafayette | Qwest Corporation | Landline |
| 303-605 | Denver | Denver | Qwest Corporation | Landline |
| 303-606 | Denver | Denver | Qwest Corporation | Landline |
| 303-607 | Denver | Denver | Qwest Corporation | Landline |
| 303-608 | Denver | Denver | Qwest Corporation | Landline |
| 303-609 | Denver | Denver | Usa Mobility Wireless, Inc. | Wireless |
| 303-610 | Denver | Denver | Usa Mobility Wireless, Inc. | Wireless |
| 303-612 | Denver | Denver | Usa Mobility Wireless, Inc. | Wireless |
| 303-613 | Denver | Denver | Usa Mobility Wireless, Inc. | Wireless |
| 303-614 | Denver | Denver | Qwest Corporation | Landline |
| 303-615 | Denver | Denver | Qwest Corporation | Landline |
| 303-616 | Denver | Denver | Usa Mobility Wireless, Inc. | Wireless |
| 303-617 | Arapahoe | Aurora | Qwest Corporation | Landline |
| 303-618 | Denver | Denver | New Cingular Wireless Pcs, Llc | Wireless |
| 303-619 | Denver | Denver | New Cingular Wireless Pcs, Llc | Wireless |
| 303-620 | Denver | Denver | Qwest Corporation | Landline |
| 303-621 | Elbert | Kiowa | Qwest Corporation | Landline |
| 303-622 | Not available. | Not available. | Strasburg Telephone Co. | Landline |
| 303-623 | Denver | Denver | Qwest Corporation | Landline |
| 303-624 | Denver | Denver | Qwest Corporation | Landline |
| 303-625 | Denver | Denver | Icg Telecom Group - CO | Landline |
| 303-626 | Denver | Denver | Qwest Corporation | Landline |
| Phone Number 303-201-8404 |
USAGE Wireless |
City Denver |
Operate Read more about who called from 3032018404 |
Update Time Mar-26-2026 |
| Phone Number 303-255-5348 |
USAGE Landline |
City Denver |
Operate Read more about who called from 3032555348 |
Update Time Mar-26-2026 |
| Phone Number 303-256-1031 |
USAGE Landline |
City Denver |
Operate Read more about who called from 3032561031 |
Update Time Mar-26-2026 |
| Phone Number 303-982-0741 |
USAGE Landline |
City Denver |
Operate Read more about who called from 3039820741 |
Update Time Mar-26-2026 |
| Phone Number 303-659-1181 |
USAGE Landline |
City Brighton |
Operate Read more about who called from 3036591181 |
Update Time Mar-26-2026 |
| Phone Number 303-242-3254 |
USAGE Landline |
City Westminster |
Operate Read more about who called from 3032423254 |
Update Time Mar-26-2026 |
| Phone Number 303-350-3027 |
USAGE Landline |
City Denver |
Operate Read more about who called from 3033503027 |
Update Time Mar-26-2026 |
| Phone Number 303-246-6517 |
USAGE Wireless |
City Englewood |
Operate Read more about who called from 3032466517 |
Update Time Mar-26-2026 |
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