| 3216 | c90 | D | Loudn FD 6A | Dispatch (also 6P) | Fire Dispatch |
| 3248 | cb0 | D | Loudn FD 6B | Response | Fire-Tac |
| 3280 | cd0 | D | Loudn FD 6C | Incident 1 | Fire-Tac |
| 3312 | cf0 | D | Loudn FD 6D | Incident 2 | Fire-Tac |
| 3344 | d10 | D | Loudn FD 6E | Incident 3 | Fire-Tac |
| 3376 | d30 | D | Loudn FD 6F | Incident 4 | Fire-Tac |
| 3408 | d50 | D | Loudn FD 6G | Annoucement (Announces Across CMND/DIV1/DIV2/DIV3/DIV4) | Fire-Tac |
| 3440 | d70 | D | Loudn FD 6H | Command | Fire-Tac |
| 3472 | d90 | D | Loudn FD 6I | Division 1 | Fire-Tac |
| 3504 | db0 | D | Loudn FD 6J | Division 2 | Fire-Tac |
| 3536 | dd0 | D | Loudn FD 6K | Division 3 | Fire-Tac |
| 3568 | df0 | D | Loudn FD 6L | Division 4 | Fire-Tac |
| 3600 | e10 | D | Loudn FD 6M | Loudoun Hospital 1 (Lansdowne) | Hospital |
| 3632 | e30 | D | Loudn FD 6N | Loudoun Hospital 2 (Cornwall) | Hospital |
| 3696 | e70 | D | Loudn FD Adm | Admin | Fire-Talk |
| 3728 | e90 | D | LoudnFD Prev | Fire Prevention | Fire-Talk |
| 3760 | eb0 | D | LoudnFDMarsh | Fire Marshal | Fire-Talk |
| 3792 | ed0 | DE | Loudn FD Inv | Arson Investigators | Fire-Talk |
| 3824 | ef0 | D | LoudnFD Trn1 | Fire Training 1 | Fire-Talk |
| 3856 | f10 | D | LoudnFD Trn2 | Fire Training 2 | Fire-Talk |
| 57360 | e010 | A | Loudn FD MA | Mutual Aid Patch to 6B Used by Frederick County, MD | Interop |
| 57392 | e030 | A | Loudn FD MA | Mutual Aid Patch | Interop |
