| Business | Phone |
| Drinking Driver Monitor Prgrm 100 E All Saints St, Frederick 21701 | (301) 631-3099 |
| Frederick Cnty Register-Wills 100 W Patrick St, Frederick 21701 | (301) 663-3722 |
| Highway Administration 5111 Buckeystown Pike, Frederick 21704 | (301) 624-8100 |
| Sue Hecht State Delegate 6 N East St # 200, Frederick 21701 | (301) 698-0054 |