Definition of "Frontier"

An unincorporated community in Koochiching County, Minnesota, United States, located on the Canadian border.  examples

A city in North Dakota.  examples

An unincorporated community in Lincoln County, Wyoming.  examples

A village in Saskatchewan, Canada.  examples

The Rural Municipality of Frontier No. 19, a rural municipality on the US border in south-west Saskatchewan, which includes the village.  examples