Some of these may be allocated to the municipal level at the discretion of the provincial government. With respect to certain matters, such as immigration, the federal and provincial governments have concurrent jurisdiction. The provinces and territories control the establishment and operation of local units of government within their borders. The categories and functions of local governmental units vary from province to province, depending on population density and local custom. In densely populated areas, such as southern Ontario, the system of local governmental units includes counties, districts, cities, towns, villages, and townships. Large metropolitan areas may have regional governments comprising several local governments.
Certain powers, such as transit and regional planning, are the responsibility of the regional government, although each local unit usually retains powers of local self-government, with responsibility for local public services. Unincorporated rural districts are usually administered by the provincial or territorial government.Bibliography:encarta 95