Thunder Bay is a city in, and the seat of,
Thunder Bay District,
Ontario,
Canada. It is the most populous municipality in
Northwestern Ontario with a population of 108,359 as of the
Canada 2011 Census, and the second most populous in
Northern Ontario after
Greater Sudbury. The
census metropolitan area of Thunder Bay has a population of 121,596, and consists of the city of Thunder Bay, the municipalities of
Oliver Paipoonge and
Neebing, the townships of
Shuniah,
Conmee,
O'Connor, and
Gillies, and the
Fort William First Nation.