From Wikipedia:

The Iroquois (Haudenosaunee or People of the Longhouses) who lived in New York, Ontario, and Quebec built and lived in longhouses. Longer than they were wide, these longhouses had openings at both ends that served as doors and were covered with animal skins during the winter to keep out the cold. On average a typical longhouse was about 80 by 18 by 18 ft (24 by 5.5 by 5.5 m) and was meant to house up to twenty or more families, most of which were typically matrilinearly related. Poles were set in the ground and braced by horizontal poles along the walls. The roof is made by bending a series of poles, resulting in an arc-shaped roof. The frame is covered by bark that is sewn in place and layered as shingles, and reinforced by light poles… Ventilation openings, later singly dubbed as a smoke hole, were positioned at intervals possibly totalling five to six along the roofing of the longhouse.

Tribes or ethnic groups in the northeast of North America, south and east of Lake Ontario and Lake Erie that had traditions of building longhouses are, among others, the Iroquois Confederacy (Haudenosaunee) including the Five Nations Seneca, Cayuga, Onondaga, Oneida and Mohawk. Also the Wyandot and Erie. Another large group that built longhouses, among others, were the Lenni Lenape, living from the lower Hudson River, along the Delaware River and on both sides of the Delaware Bay, and the Pamunkey of the maybe-related Powhatan Confederacy in Virginia.