| Business | Phone |
| Eco Village Of Loudoun City Frederick 21701 | (301) 662-4646 |
| Frederick Accounting Office 101 N Court St, Frederick 21701 | (301) 694-1398 |
| Frederick Board Of Alderman 101 N Court St, Frederick 21701 | (301) 694-1386 |
| Frederick Budget Director 101 N Court St, Frederick 21701 | (301) 694-1397 |
| Frederick Cashier 101 N Court St, Frederick 21701 | (301) 694-1422 |
| Frederick City Building Dept 101 N Court St, Frederick 21701 | (301) 360-3812 |
| Frederick City Engineer 101 N Court St, Frederick 21701 | (301) 694-1404 |
| Frederick City Permit Director 4 W 7th St, Frederick 21701 | (301) 360-3812 |
| Frederick Engineering Dept 101 N Court St, Frederick 21701 | (301) 694-1405 |
| Frederick Human Resources 111 Airport Dr E, Frederick 21701 | (301) 694-1388 |
| Frederick Legal Svc Office Frederick 21701 | (301) 694-2518 |
| Frederick Light & Signal Dept 111 Airport Dr E, Frederick 21701 | (301) 694-1167 |
| Frederick Paint & Sign Dept 111 Airport Dr E, Frederick 21701 | (301) 694-1379 |
| Frederick Public Parking Fac 17 E Church St, Frederick 21701 | (301) 694-1428 |
| Frederick Public Parking Fac 2 S Court St, Frederick 21701 | (301) 694-1429 |
| Frederick Sewer Dept 101 N Court St, Frederick 21701 | (301) 694-1421 |
| Frederick Water Construction 111 Airport Dr E, Frederick 21701 | (301) 694-1169 |
| Purchasing Dept Of Frederick 111 Airport Dr E, Frederick 21701 | (301) 694-1194 |