| Business | Phone |
| Emcor Facilities Svc Inc Brookley Ave, Washington 20374 | (202) 889-9205 |
| Consolidated Engineering Svc 2201 C St Nw, Washington 20520 | (202) 331-3392 |
| Development Resources Inc Engr 810 7th St Nw, Washington 20001 | (202) 842-4438 |
| Bae Systems 4301 Connecticut Ave Nw, Washington 20008 | (202) 274-3000 |
| Bae Systems 80 M St Se # 200, Washington 20003 | (202) 203-6000 |
| Bailey Engineering Systems Inc 1915 5th St Ne, Washington 20002 | (202) 832-4375 |
| Bicentennial Building 600 E St Nw, Washington 20004 | (202) 638-3790 |
| Blake Development Co 1025 Connecticut Ave Nw, Washington 20036 | (202) 223-5784 |
| Canal Square Assoc 1054 31st St Nw, Washington 20007 | (202) 338-9486 |
| Dynamic Engineering 1818 New York Ave Ne # 206, Washington 20002 | (202) 269-3142 |
| Dynamic Engineering 3500 E Capitol St Ne, Washington 20019 | (202) 388-4182 |
| E B Advanced Pc 2233 Wisconsin Ave Nw # 217, Washington 20007 | (202) 342-1992 |
| E M Federal Engineering Inc 1010 Vermont Ave Nw, Washington 20005 | (202) 737-6390 |
| Ecosystem Surveys & Engnrng 1025 Connecticut Ave Nw, Washington 20036 | (202) 857-9768 |
| Elma Analysis Group & Engr Svc 325 Pennsylvania Ave Se, Washington 20003 | (202) 675-6329 |
| Empire Engineering Assoc 325 Pennsylvania Ave Se, Washington 20003 | (202) 675-6304 |
| Horne Engineering Svc Inc 400 Virginia Ave Sw # 350, Washington 20024 | (202) 554-3100 |
| Indiana Building Engineer's 633 Indiana Ave Nw, Washington 20004 | (202) 347-2684 |
| Jacobs Engineering Group Inc 413 New Jersey Ave Se, Washington 20003 | (202) 544-3233 |
| Lincoln Property Co 409 7th St Nw, Washington 20004 | (202) 347-5808 |
| Michael Baker Jr Inc 1300 Pennsylvania Ave Nw C007, Washington 20004 | (202) 289-4189 |
| Montgomery Watson 1133 21st St Nw # 710, Washington 20036 | (202) 296-5354 |
| Panamsat Corp 1801 K St Nw, Washington 20006 | (202) 292-4300 |
| Quasar's Inc 955 Lenfant Plz Sw # 1201, Washington 20024 | (202) 863-4430 |
| Records Engineering 1101 Pennsylvania Ave Nw, Washington 20004 | (202) 756-2277 |
| S C Harmen & Assoc 1441 L St Nw, Washington 20005 | (202) 452-1169 |
| Saitex Engineering 1412 4th St Sw, Washington 20024 | (202) 479-0430 |
| Windermere 525 School St Sw, Washington 20024 | (202) 484-8247 |
| Weidlinger Associates 1030 15th St Nw # 950, Washington 20005 | (202) 326-9070 |
| Vanderweil Engineers 1250 24th St Nw, Washington 20037 | (202) 776-7745 |
| 1300 Ct Avenue Engr 1300 Connecticut Ave Nw, Washington 20036 | (202) 331-0368 |
| 1747 Penn Engineers' Ofc Co 1747 Pennsylvania Ave Nw, Washington 20006 | (202) 466-9052 |
| Alpha International 5335 Wisconsin Ave Nw # 440, Washington 20015 | (202) 895-1703 |