| 535 | 217 | D | HC MA 1 | Harris County Mutual Aid 1 | Interop |
| 537 | 219 | D | HC MA 2 | Harris County Mutual Aid 2 (Primary Air-Ground EMS) | Interop |
| 889 | 379 | D | HC MA 3 | Harris County Mutual Aid 3 | Interop |
| 1159 | 487 | D | HC MA 4 | Harris County Mutual Aid 4 | Interop |
| 1161 | 489 | D | HC MA 5 | Harris County Mutual Aid 5 | Interop |
| 1163 | 48b | D | HC MA 6 | Harris County Mutual Aid 6 | Interop |
| 2387 | 953 | D | ET PS Disp | East Texas Public Safety Dispatch | Interop |
| 2388 | 954 | D | ET PS Tac | East Texas Public Safety Tactical | Interop |
| 3624 | e28 | D | HC MA 7 | Harris County Mutual Aid 7 | Interop |
| 3626 | e2a | D | HC MA 8 | Harris County Mutual Aid 8 | Interop |
| 3628 | e2c | D | HC MA 9 | Harris County Mutual Aid 9 | Interop |
| 3630 | e2e | D | HC MA 10 | Harris County Mutual Aid 10 | Interop |
| 4086 | ff6 | D | HC MA 11 | Harris County Mutual Aid 11 | Interop |
| 4087 | ff7 | D | HC MA 12 | Harris County Mutual Aid 12 | Interop |
| 4088 | ff8 | D | HC MA 13 | Harris County Mutual Aid 13 | Interop |
| 4089 | ff9 | D | HC MA 14 | Harris County Mutual Aid 14 | Interop |
