Area code 303
3,242 number blocks indexed across 37 carriers.
States: CO (3,242)
Carriers
| OCN | Company | HQ | Type | Blocks | Recent | Website |
|---|---|---|---|---|---|---|
| 6567 | Cellco Partnership dba Verizon Wireless - CO | Olathe, KS | Wireless Carrier | 324 | 11 | verizonwireless.com |
| 026D | Onvoy LLC - CO | Chicago, IL | Competitive Local Exchange Carrier | 231 | 3 | sinch.com |
| 624H | Onvoy Spectrum LLC | Broomfield, CO | Wireless Carrier | 36 | 1 | |
| 732J | NUSO LLC | University City, MO | IP-Enabled Service / VoIP | 1 | 1 | brightlink.com |
| 9636 | Qwest Corporation | Minneapolis, MN | Regional Bell Operating Company | 1,035 | — | centurylink.com |
| 6529 | T-Mobile USA Inc | Bellevue, WA | Personal Communications Service (Wireless) | 375 | — | t-mobile.com |
| 6118 | Level 3 Communications LLC - CO | Westminster, CO | Competitive Local Exchange Carrier | 325 | — | centurylink.com |
| 7378 | Teleport Communications America LLC - CO | Staten Island, NY | Competitive Local Exchange Carrier | 210 | — | att.com |
| 6010 | New Cingular Wireless PCS LLC | Kirkland, WA | Wireless Carrier | 188 | — | att.com |
| 7229 | MCImetro Access Transmission Services LLC | Vienna, VA | Competitive Local Exchange Carrier | 185 | — | verizon.com |
| 318J | Comcast IP Phone LLC | Philadelphia, PA | IP-Enabled Service / VoIP | 112 | — | comcast.com |
| 3467 | Electric Lightwave LLC dba Allstream | Minneapolis, MN | Competitive Local Exchange Carrier | 34 | — | allstream.com |
| 6630 | Spok Inc | Plano, TX | Wireless Carrier | 31 | — | spok.com |
| 078F | Bandwidth.com CLEC LLC - CO | Cary, NC | Competitive Local Exchange Carrier | 29 | — | bandwidth.com |
| 829J | PAETEC iTel LLC | Charlotte, NC | IP-Enabled Service / VoIP | 18 | — | |
| 4574 | Level 3 Telecom of Colorado LLC - CO | Littleton, CO | Competitive Local Exchange Carrier | 15 | — | centurylink.com |
| MULT | Multiple OCN Listing | Administrative / Reserved | 14 | — | ||
| 321J | HD Carrier LLC | Henderson, NV | IP-Enabled Service / VoIP | 11 | — | hdcarrier.com |
| 9748 | American Messaging Services LLC | Lewisville, TX | Wireless Carrier | 11 | — | americanmessaging.net |
| 5562 | T-Mobile USA Inc | Dallas, TX | Personal Communications Service (Wireless) | 9 | — | metropcs.com |
| 939H | Commio LLC | Austin, TX | IP-Enabled Service / VoIP | 8 | — | commio.com |
| 6874 | NE Colorado Cellular Inc | Fort Morgan, CO | Wireless Carrier | 7 | — | mycellularone.com |
| 508J | CenturyLink Communications LLC | Littleton, CO | IP-Enabled Service / VoIP | 5 | — | centurylink.com |
| 2207 | Strasburg Telephone Company | Madison, WI | Incumbent Local Exchange Carrier | 4 | — | tdstelecom.com |
| 5972 | Interlink Advertising Services Inc dba Forethought.Net - CO | Denver, CO | Competitive Local Exchange Carrier | 4 | — | forthought.net |
| 3044 | Live Wire Networks Inc - CO | Denver, CO | Competitive Local Exchange Carrier | 3 | — | livewirenet.com |
| 2181 | Bijou Telephone Cooperative Association Inc | Byers, CO | Incumbent Local Exchange Carrier | 2 | — | netecin.net |
| 278F | Peerless Network of Colorado LLC - CO | Chicago, IL | Competitive Local Exchange Carrier | 2 | — | peerlessnetwork.com |
| 622J | Skye Telecom LLC dba Skyetel | Vancouver, WA | IP-Enabled Service / VoIP | 2 | — | skyetel.com |
| 6907 | Communications Unlimited | Denver, CO | Wireless Carrier | 2 | — | communicationsunltd.com |
| 765B | Elbert County Wireless LLC | Burr Ridge, IL | Wireless Carrier | 2 | — | commnetwireless.com |
| 881B | iLoka Inc dba NewCloud Networks - CO | Denver, CO | Competitive Local Exchange Carrier | 2 | — | |
| 073H | Telnyx LLC | Chicago, IL | IP-Enabled Service / VoIP | 1 | — | telnyx.com |
| 2186 | Eastern Slope Rural Telephone Association Inc | Hugo, CO | Incumbent Local Exchange Carrier | 1 | — | myestech.com |
| 2202 | Roggen Telephone Cooperative Company | Roggen, CO | Incumbent Local Exchange Carrier | 1 | — | rtebb.net |
| 490J | Boost SubscriberCo LLC | Washington, DC | Wireless Carrier | 1 | — | dish.com |
| 7421 | AT&T Local | Bedminster, NJ | Competitive Local Exchange Carrier | 1 | — | att.com |