[2][3] Frontier is located in northeastern Woodbridge Township in southern Hillsdale County about 40 miles (64 km) south of the city of Jackson.

The nearest city is Hillsdale about 11.0 miles (17.7 km) to the north, while nearby villages include Montgomery to the west, Camden to the southwest, Reading to the northwest, and Waldon to the southeast.

Other nearby unincorporated communities include Ransom to the east, Cambria to the northwest, Shadyside and Fountain Park to the northeast, and Austin to the southwest.

[5] The Woodbridge Township government office and fire department are located in the western portion of the community along East Montgomery Road.

[9][10] The area was first settled by the William Saxton family in 1834, which was one year before Hillsdale County was officially organized in the Michigan Territory.

[11] Saxton was originally from Canandaigua, New York and moved to Michigan, first residing in Raisin Township in Lenawee County.

[13][14] In an 1857 map of Hillsdale County, the Saxton and Duealer homesteads, among other families, can be seen in section 12 in the northeast portion of Woodbridge Township.