The registered population of Lac Seul was 2,837 persons in April of 2008, of which the on-reserve population was 774. The First Nation have the 26,821.5 hectares (104 sq mi) Lac Seul 28 Indian Reserve, known as Obishikokaang in the Anishinaabe language, containing three settlements. Frenchmen's Head is accessible by road and is approximately 40 kilometres (25 mi) from Sioux Lookout. Whitefish Bay is also newly accessible by road and is approximately 50 kilometres (31 mi) from Sioux Lookout, Ontario. Kejick Bay is approximately 60 kilometres (37 mi) northwest of Sioux Lookout and is accessible by road and water and air. Frenchmen's Head and Kejick Bay each have a population of about 400 each, while Whitefish Bay has a population of about 100.
In 1929 Ontario Hydro constructed a dam at Ear Falls to control the level of the lake to produce hydroelectricity. The flooding from turning the lake into a reservoir caused the area known previously as Kejick Bay to become an island, permanently separating it from the mainland and splitting the community into two parts. The island portion retained the name Kejick Bay and the portion of the community on the mainland became Whitefish Bay.
The French name for the lake and the reserve, Lac Seul, may be a mistranslation of Obishikokaang as Obezhigokaang. The meaning of Obishikokaang is not known but the typical translation of Obishikokaang provided is "Narrows [Abundant] with White Pine" or "White Pine Narrows", which in common Ojibwe should be something closer to Obaazhingokaang.
The First Nation is governed by Chief Clifford Bull and eight councillors: Elvis Trout, Selina Vincent, Floyd Vincent, David Gordon, Derek Maud, Gerald Kejick, Dean Ross, and Norman Thomas. Of the councillors, four are from Frenchman's Head, three are from Kejick Bay and one from Whitefish Bay.