The East and West Zones are divided into three subzones with a Director representing each subzone. The subzones are as follows:
| Subzone | MHA's |
| East Zone 1 | Schreiber, Terrace Bay, Marathon, Manitouwadge, Fallen Rock |
| East Zone 2 | Longlac, Geraldton |
| East Zone 3 | Nipigon |
| West Zone 1 | Atikokan, Fort Frances, Emo, Devlin, Barwick |
| West Zone 2 | Kenora |
| West Zone 3 | Ignance, Dryden, Sioux Lookout, Hudson, Ear Falls, Red Lake, Vermilion Bay |
