The Census Subdivision Boundary Files portray the boundaries of all census subdivisions in Canada. A census subdivision is an administrative area which is a component of the Standard Geographical Classification. Census subdivision is the general term for municipalities, as determined by provincial and territorial legislation, or areas treated as municipal equivalents for statistical purposes, for example, Indian reserves, Indian settlements and unorganized territories.

CSDUID - Uniquely identifies a census subdivision (composed of 2-digit province/territory code, 2-digit census division code and 3-digit census subdivision code).