Local-number carriers in Maryland (MD)
← all states · area codes: 240 (7,522) · 443 (7,298) · 301 (4,587) · 410 (4,482) · 667 (3,896) · 227 (1,137)
Top carrier groups in Maryland
Multiple state-OCNs from the same brand are rolled up here. Bar length is total blocks; red overlay is recent activity in the last 18 months.
Show full table (25 groups)
| Group | Type | OCNs in MD | Blocks | Recent |
|---|---|---|---|---|
| AT&T | Wireless Carrier | 4 | 3,637 | 526 |
| Onvoy | Competitive Local Exchange Carrier | 1 | 3,090 | 253 |
| T-Mobile | Personal Communications Service (Wireless) | 3 | 5,151 | 228 |
| Verizon | Wireless Carrier | 5 | 8,132 | 125 |
| Dish Wireless | Wireless Carrier | 1 | 99 | 46 |
| Bandwidth.com | Competitive Local Exchange Carrier | 2 | 1,645 | 13 |
| Terra Nova Telecom | IP-Enabled Service / VoIP | 1 | 18 | 12 |
| Onvoy Spectrum | Wireless Carrier | 1 | 726 | 6 |
| Peerless Network | Competitive Local Exchange Carrier | 1 | 503 | 6 |
| Wavenation | IP-Enabled Service / VoIP | 1 | 6 | 6 |
| HD Carrier | IP-Enabled Service / VoIP | 1 | 96 | 4 |
| Centurylink | Competitive Local Exchange Carrier | 3 | 1,391 | 3 |
| Comcast | IP-Enabled Service / VoIP | 1 | 949 | 3 |
| Brightlink Communications | IP-Enabled Service / VoIP | 3 | 111 | 3 |
| Leap Telecom | IP-Enabled Service / VoIP | 1 | 7 | 3 |
| TELNYX | IP-Enabled Service / VoIP | 1 | 239 | 2 |
| Windstream | IP-Enabled Service / VoIP | 1 | 1,496 | · |
| CoreTel | Competitive Local Exchange Carrier | 3 | 300 | · |
| Commio | IP-Enabled Service / VoIP | 1 | 223 | · |
| YMax Communications | Competitive Local Exchange Carrier | 1 | 165 | · |
| Local Access | Competitive Local Exchange Carrier | 1 | 147 | · |
| Ton80 Communications | IP-Enabled Service / VoIP | 1 | 103 | · |
| MULTIPLE OCN LISTING | Administrative / Reserved | 1 | 79 | · |
| Vonage Network | IP-Enabled Service / VoIP | 1 | 79 | · |
| Baltimore-Washington Telephone Company | Competitive Local Exchange Carrier | 1 | 73 | · |
Area codes in Maryland
Sized by total number blocks indexed in each area code. Click any NPA for its full carrier directory.
All OCNs in Maryland
| OCN | Company | Group | HQ | Type | Blocks | Recent | Website |
|---|---|---|---|---|---|---|---|
| 4036 | New Cingular Wireless PCS LLC - DC | AT&T | Atlanta | Wireless Carrier | 3,078 | 509 | att.com |
| 876D | Onvoy LLC - MD | Onvoy | Chicago | Competitive Local Exchange Carrier | 3,090 | 253 | sinch.com |
| 6855 | Omnipoint Communications Cap Operations LLC | T-Mobile | Cedar Knolls | Personal Communications Service (Wireless) | 4,106 | 227 | t-mobile.com |
| 6395 | Cellco Partnership dba Verizon Wireless - MD | Verizon | Olathe | Wireless Carrier | 2,531 | 121 | verizonwireless.com |
| 490J | Boost SubscriberCo LLC | Dish Wireless | Washington | Wireless Carrier | 99 | 46 | dish.com |
| 071F | Bandwidth.com CLEC LLC - MD | Bandwidth.com | Cary | Competitive Local Exchange Carrier | 1,644 | 13 | bandwidth.com |
| 7325 | Teleport Communications America LLC - MD | AT&T | Staten Island | Competitive Local Exchange Carrier | 384 | 13 | att.com |
| 145J | Terra Nova Telecom Inc | Terra Nova Telecom | Lakewood Ranch | IP-Enabled Service / VoIP | 18 | 12 | terranova.net |
| 624H | Onvoy Spectrum LLC | Onvoy Spectrum | Broomfield | Wireless Carrier | 726 | 6 | |
| 568G | Peerless Network of Maryland LLC | Peerless Network | Chicago | Competitive Local Exchange Carrier | 503 | 6 | peerlessnetwork.com |
| 700J | Wavenation LLC | Wavenation | Chicago | IP-Enabled Service / VoIP | 6 | 6 | peerlessnetwork.com |
| 7228 | MCImetro Access Transmission Services LLC - MD | Verizon | Vienna | Competitive Local Exchange Carrier | 391 | 4 | verizon.com |
| 321J | HD Carrier LLC | HD Carrier | Henderson | IP-Enabled Service / VoIP | 96 | 4 | hdcarrier.com |
| 7421 | AT&T Local | AT&T | Bedminster | Competitive Local Exchange Carrier | 19 | 4 | att.com |
| 6119 | Level 3 Communications LLC - MD | Centurylink | Westminster | Competitive Local Exchange Carrier | 1,118 | 3 | centurylink.com |
| 318J | Comcast IP Phone LLC | Comcast | Philadelphia | IP-Enabled Service / VoIP | 949 | 3 | comcast.com |
| 732J | NUSO LLC | Brightlink Communications | University City | IP-Enabled Service / VoIP | 22 | 3 | brightlink.com |
| 616J | Leap Telecom LLC | Leap Telecom | Denver | IP-Enabled Service / VoIP | 7 | 3 | leap.tel |
| 073H | Telnyx LLC | TELNYX | Chicago | IP-Enabled Service / VoIP | 239 | 2 | telnyx.com |
| 5562 | T-Mobile USA Inc | T-Mobile | Dallas | Personal Communications Service (Wireless) | 1,018 | 1 | metropcs.com |
| 9212 | Verizon Maryland Inc | Verizon | Falls Church | Regional Bell Operating Company | 4,281 | · | verizon.com |
| 829J | PAETEC iTel LLC | Windstream | Charlotte | IP-Enabled Service / VoIP | 1,496 | · | |
| 7229 | MCImetro Access Transmission Services LLC | Verizon | Vienna | Competitive Local Exchange Carrier | 925 | · | verizon.com |
| 2593 | Core Communications Inc - MD | CoreTel | Annapolis | Competitive Local Exchange Carrier | 289 | · | coretel.net |
| 939H | Commio LLC | Commio | Austin | IP-Enabled Service / VoIP | 223 | · | commio.com |
| 281E | YMax Communications Corporation - MD | YMax Communications | Palm Beach | Competitive Local Exchange Carrier | 165 | · | ymaxcorp.com |
| 7529 | Teleport Communications America LLC - DC | AT&T | Staten Island | Competitive Local Exchange Carrier | 156 | · | att.com |
| 082H | Local Access LLC - MD | Local Access | Windermere | Competitive Local Exchange Carrier | 147 | · | |
| 7591 | Level 3 Telecom of Maryland LLC - MD | Centurylink | Columbia | Competitive Local Exchange Carrier | 140 | · | centurylink.com |
| 508J | CenturyLink Communications LLC | Centurylink | Littleton | IP-Enabled Service / VoIP | 133 | · | centurylink.com |
| 516J | Ton80 Communications LLC | Ton80 Communications | Anderson | IP-Enabled Service / VoIP | 103 | · | coretel.net |
| 197D | Vonage America LLC | Vonage Network | Holmdel | IP-Enabled Service / VoIP | 79 | · | vonage.com |
| MULT | Multiple OCN Listing | MULTIPLE OCN LISTING | Administrative / Reserved | 79 | · | ||
| 551G | NUSO LLC | Brightlink Communications | Atlanta | Wireless Carrier | 76 | · | 365wireless.net |
| 8697 | Baltimore-Washington Telephone (BWT) | Baltimore-Washington Telephone Company | Laurel | Competitive Local Exchange Carrier | 73 | · | bwtel.com |
| 8832 | Starpower Communications LLC - MD | RCN Starpower | Princeton | Competitive Local Exchange Carrier | 61 | · | astound.com |
| 4492 | VDL Inc dba Global Telecom Brokers - MD | Global Telecom Brokers | Owings Mills | Competitive Local Exchange Carrier | 49 | · | xtel.net |
| 228C | IDT America Corporation - MD | IDT America | Newark | Underlying Local Exchange Carrier | 47 | · | idt.net |
| 964H | Barr Tell USA Inc | Barr Tell USA | Long Beach | Competitive Local Exchange Carrier | 43 | · | barrtell.com |
| 4720 | USCOC of Cumberland Inc dba United States Cellular - MD | U.S. Cellular | Chicago | Wireless Carrier | 39 | · | uscellular.com |
| 6630 | Spok Inc | USA Mobility | Plano | Wireless Carrier | 37 | · | spok.com |
| 2596 | Quantum Telecommunications Inc - MD | Quantum Telecommunications | Manchester | Competitive Local Exchange Carrier | 28 | · | qis.net |
| 6626 | Omnipoint Communications Enterprises LP | T-Mobile | Cedar Knolls | Personal Communications Service (Wireless) | 27 | · | t-mobile.com |
| 965H | Fractel LLC | Fractel | Indialantic | IP-Enabled Service / VoIP | 26 | · | fractel.net |
| 361H | Atlantech Online Inc - MD | Atlantech Online | Silver Spring | Competitive Local Exchange Carrier | 19 | · | atlantech.net |
| 478J | NUSO LLC | Brightlink Communications | Atlanta | IP-Enabled Service / VoIP | 13 | · | brightlink.com |
| 530H | Wide Voice LLC - MD | Wide Voice | Las Vegas | Competitive Local Exchange Carrier | 12 | · | widevoice.com |
| 420C | Armstrong Telecommunications Inc - MD | Armstrong Telecommunications Inc | Butler | Competitive Local Exchange Carrier | 11 | · | armstrongonewire.com |
| 469J | Coretel Maryland Inc - MD | CoreTel | Anderson | Competitive Local Exchange Carrier | 10 | · | coretel.net |
| 836G | Shentel Communications LLC - MD | Shentel Communications LLC | Edinburg | Competitive Local Exchange Carrier | 9 | · | shentel.com |
| 425J | CSC Wireless LLC | CSC Wireless | Long Island City | Wireless Carrier | 8 | · | alticeusa.com |
| 861F | MCC Telephony of the Mid-Atlantic LLC - MD | MCC Telephony | Middletown | Competitive Local Exchange Carrier | 7 | · | mediacomcc.com |
| 475J | Callworks Corporation | Callworks Corporation | Fair Oaks | IP-Enabled Service / VoIP | 6 | · | callworks.me |
| 506J | Twilio International Inc | Twilio International | San Francisco | IP-Enabled Service / VoIP | 6 | · | twilio.com |
| 515J | IP Horizon LLC | IP Horizon | Orlando | IP-Enabled Service / VoIP | 5 | · | |
| 792K | Charter IP Enabled Services LLC | Charter IP Enabled Services | Saint Louis | IP-Enabled Service / VoIP | 5 | · | |
| 114J | Exiant Communications LLC | Exiant | Eldersburg | IP-Enabled Service / VoIP | 4 | · | exiantcom.com |
| 181J | Advanced Telecom Solutions LLC | Advanced Telecom Solutions | Bethesda | IP-Enabled Service / VoIP | 4 | · | turbobridge.com |
| 4773 | XO Maryland LLC | Verizon | Reston | Competitive Local Exchange Carrier | 4 | · | verizon.com |
| 598J | Five9 InC | Five9 | San Ramon | IP-Enabled Service / VoIP | 4 | · | five9.com |
| 820C | Intrado Communications LLC | Intrado Communications | Bedminster | Competitive Local Exchange Carrier | 4 | · | att.com |
| 996H | Airespring Inc | Airespring | Van Nuys | IP-Enabled Service / VoIP | 4 | · | airespring.com |
| 6810 | Redi-Call Communications Company | Redi-Call Communications | Georgetown | Wireless Carrier | 3 | · | redi-call.com |
| 9748 | American Messaging Services LLC | American Messaging Services LLC | Lewisville | Wireless Carrier | 3 | · | americanmessaging.net |
| 139F | Evolve Cellular Inc | Evolve Cellular | Austin | Wireless Carrier | 2 | · | worldcall.net |
| 2554 | Global NAPS South Inc - MD | Global NAPS | Norwood | Competitive Local Exchange Carrier | 2 | · | globalnaps.org |
| 507J | The Voice Application Network LLC | Wide Voice | El Segundo | IP-Enabled Service / VoIP | 2 | · | widevoice.com |
| 676A | Mountain Communications LLC dba Procom - MD | ProCom | Bruceton Mills | Competitive Local Exchange Carrier | 2 | · | 4-procom.com |
| 691H | Airus Inc - MD | Airus | Chicago | Competitive Local Exchange Carrier | 2 | · | airustel.com |
| 0216 | Armstrong Telephone Company of Maryland | Armstrong Telecommunications Inc | Butler | Incumbent Local Exchange Carrier | 1 | · | armstrongonewire.com |
| 074F | Bandwidth.com CLEC LLC - DC | Bandwidth.com | Cary | Competitive Local Exchange Carrier | 1 | · | bandwidth.com |
| 156J | RCLEC Inc | RCLEC | Centennial | IP-Enabled Service / VoIP | 1 | · | rclec.com |
| 3806 | Core Communications Inc - PA | CoreTel | Annapolis | Competitive Local Exchange Carrier | 1 | · | coretel.net |
| 8605 | MTE Inc dba MTE Paging Network | MTE Paging | Falls Church | Wireless Carrier | 1 | · |