| 16 | 010 | D | PDMA 1 | Police Mutual Aid 1 (Sheriff Ch. A9) | Law Talk |
| 32 | 020 | D | PDMA 2 | Police Mutual Aid 2 (Sheriff Ch. B9) | Law Talk |
| 48 | 030 | D | G1 FDPD1 | Fire-Police 1 | Interop |
| 64 | 040 | D | G2 FDPD2 | Fire-Police 2 | Interop |
| 80 | 050 | D | A10 SPEV1 | Special Events 1 | Multi-Tac |
| 96 | 060 | D | B10 SPEV2 | Special Events 2 | Multi-Tac |
| 112 | 070 | D | C10 SPEV3 | Special Events 3 | Multi-Tac |
| 128 | 080 | D | G8 LGMA | Harford County Local Government Mutual Aid | Multi-Tac |
| 2912 | b60 | D | G6 DPW | Harford County Department of Public Works | Public Works |
| 2928 | b70 | D | Harf Transit | Harford Transit | Transportation |
| 2976 | ba0 | D | G4 DNR | Maryland Department of Natural Resources Police | Law Dispatch |
| 36800 | 8fc0 | D | N1 HACN1 | Harford County Command 1 | Emergency Ops |
| 36816 | 8fd0 | D | N2 HACN2 | Harford County Command 2 | Emergency Ops |
