| Business | Phone |
| Bray Telephone Co 200 Attestation Blvd, Washington 20024 | (202) 479-9178 |
| Chesapeake & Potomac Telephone 7th St & Florida Ave Neamp;, Washington 20002 | (202) 544-8766 |
| American Society-Cybernetics 2121 I St Nw # 230, Washington 20037 | (202) 994-5203 |
| Bell South 1133 21st St Nw # 900, Washington 20036 | (202) 463-4100 |
| Broadwing Communications 1120 Vermont Ave Nw, Washington 20005 | (202) 293-1182 |
| Cambrian Communication 900 2nd St Ne # 9-10, Washington 20002 | (202) 266-2160 |
| Contact One Communications 1015 Independence Ave Se, Washington 20003 | (202) 543-6662 |
| Crg West Llc 1275 K St Nw # 700, Washington 20005 | (202) 216-0595 |
| Future Communications 666 Pennsylvania Ave Se, Washington 20003 | (202) 546-8818 |
| General Communication Inc 1130 17th St Nw, Washington 20036 | (202) 457-8812 |
| Hannibal Communications 2128 Wyoming Ave Nw, Washington 20008 | (202) 483-1241 |
| Hasty Connections 1612 7th St Nw, Washington 20001 | (202) 986-1814 |
| In-Flight Phone Corp 1101 17th St Nw, Washington 20036 | (202) 659-0300 |
| Interactive Telecom Group 1081 Wisconsin Ave Nw, Washington 20007 | (202) 625-1625 |
| Just Jacks Co Inc 1301 Vermont Ave Nw # 308, Washington 20005 | (202) 462-2759 |
| Mci 2500 Calvert St Nw, Washington 20008 | (202) 588-7104 |
| Mci Intl 2030 M St Nw # 200, Washington 20036 | (202) 822-8705 |
| Mfs-Icc 1120 G St Nw, Washington 20005 | (202) 637-9580 |
| Mid-Atlantic Telecom 2021 L St Nw, Washington 20036 | (202) 659-4646 |
| National Telephone Enterprises 1275 K St Nw, Washington 20005 | (202) 682-5837 |
| Ntt America Inc 1300 Pennsylvania Ave Nw # 450, Washington 20004 | (202) 312-1444 |
| Overseas Telecommunication 1220 L St Nw, Washington 20005 | (202) 682-1441 |
| Powernomics Telcom 606 U St Nw, Washington 20001 | (202) 518-6800 |
| Primis Telecommunication Inc 1220 L St Nw # 206, Washington 20005 | (202) 789-0861 |
| Qwest Communications 1275 K St Nw, Washington 20005 | (202) 408-8446 |
| Qwest Communications 1500 Eckington Pl Ne # 1, Washington 20002 | (202) 548-3600 |
| Qwest Federal Policy & Law 1020 19th St Nw, Washington 20036 | (202) 429-0303 |
| Silver Star Technologies 419 Mellon St Se, Washington 20032 | (202) 563-4330 |
| Simply Wireless 660 Pennsylvania Ave Se, Washington 20003 | (202) 546-8818 |
| Starnet Corp 1025 Thomas Jefferson St Nw, Washington 20007 | (202) 342-3934 |
| Tbsspa Telecommunications 2300 N St Nw, Washington 20037 | (202) 331-2506 |
| Telecommunications Consulting 1133 20th St Nw # 800, Washington 20036 | (202) 419-3357 |
| Telecommunications Consulting 1201 Pennsylvania Ave Nw, Washington 20004 | (202) 419-3357 |
| Telecommunications Resellers 1401 K St Nw, Washington 20005 | (202) 835-9898 |
| Telephone Pioneers Of America 2055 L St Nw, Washington 20036 | (202) 392-6252 |
| X O Communications Inc 1150 Connecticut Ave Nw, Washington 20036 | (202) 296-7727 |
| Xspedius Communications 1275 K St Nw # 700, Washington 20005 | (202) 370-9150 |
| Zh Technologies Inc 1201 Pennsylvania Ave Nw, Washington 20004 | (202) 661-4709 |
| Voda Fone 2300 N St Nw, Washington 20037 | (202) 659-1277 |
| Bell South Dc Inc 1133 21st St Nw # 900, Washington 20036 | (202) 463-4100 |