The geographic area of SLAAMB consists of the following First Nation, Native organizations and First Nations Council within the town of Sioux Lookout as follows:
- Bearskin Lake First Nation
- Cat Lake First Nation
- Deer Lake First Nation
- Eagle Lake First Nation
- Fort Severn First Nation
- Kasabonika Lake First Nation
- Keewaywin First Nation
- Kingfisher Lake First Nation
- Kitchenuhmaykoosib Inninuwug (Big Trout Lake)
- Koocheching First Nation
- McDowell Lake First Nation
- Mishkeegogamang First Nation (Osnaburgh)
- Muskrat Dam First Nation
- New Slate Falls First Nation
- North Caribou Lake First Nation
- North Spirit Lake First Nation
- Pikangikum First Nation
- Poplar Hill First Nation
- Sachigo Lake First Nation
- Sandy Lake First Nation
- Saugeen First Nation
- Wabigoon First Nation
- Wapekeka First Nation
- Wawakapewin First Nation
- Wunnumin Lake First Nation