First Nations Bands vary in size quite dramatically, the largest is the Six Nations of the Grand River First Nation which had a population of 22,294 in September, 2005, and the smaller Bands often including less than one hundred members.
Each Band is represented by an elected chief, along with a band council. Though each band is its own individual unit, occasionally bands will combine regionally to create tribal councils. Often bands will have members who live off the reserve, the band government would still manage the needs of these members.
Although each band has reasonable control over the land, because most land in BC is unceeded, so the band does not technically own it. Technical ownership belongs to the crown.