| Business | Phone |
| Capitol Entertainment Svc Inc 3629 18th St Ne, Washington 20018 | (202) 636-9203 |
| Cet 1000 16th St Nw, Washington 20036 | (202) 530-0800 |
| Guild Of Pro Tour Guides-Wa 1524 35th St Nw, Washington 20007 | (202) 298-1474 |
| Guild Of Professional Tour 1045 Wisconsin Ave Nw, Washington 20007 | (202) 298-1474 |
| Heritage Tours Ltd 1025 Connecticut Ave Nw # 1012, Washington 20036 | (202) 822-9542 |
| Leone Travel Agency 6225 12th St Nw, Washington 20011 | (202) 882-4300 |
| On Tour With Natl Geographic 1000 16th St Nw, Washington 20036 | (202) 785-1703 |
| Solar Tours 1629 K St Nw, Washington 20006 | (202) 861-0599 |
| Washington Group Tours 1110 Vermont Ave Nw # 407, Washington 20005 | (202) 955-5667 |
| Ultimate Tours Inc 1884 Columbia Rd Nw # 320, Washington 20009 | (202) 234-5478 |
| Usa Hosts 1301 Connecticut Ave Nw, Washington 20036 | (202) 857-4111 |