| Business | Phone |
| Frederick Public Works 111 Airport Dr E, Frederick 21701 | (301) 694-1173 |
| Frederick Public Works Dept 101 N Court St, Frederick 21701 | (301) 694-1440 |
| Public Works 111 Airport Dr E, Frederick 21701 | (301) 694-1378 |
| Public Works-Vehicle Mntnc 111 Airport Dr E, Frederick 21701 | (301) 694-1198 |
| Public Works-Water Chemical 111 Airport Dr E, Frederick 21701 | (301) 694-1473 |