Middleton is a city in Canyon County, Idaho, United States.

[6][7] It is part of the Boise City–Nampa, Idaho Metropolitan Statistical Area.

Middleton was named for its location between the old fort Boise and Keeney's Ferry; it being the midpoint between the two.

It served as a rest stop for those heading for Keeney's Ferry.

[8] It had a stage station in the early days of the Oregon Trail, a post office in 1866 and a water powered grist mill in 1871.

[9] Middleton is the oldest settlement in Canyon County, with the land being parceled out in 1863 by William N. Montgomery.

[11] At the 2010 census there were 5,524 people in 1,843 households, including 1,392 families, in the city.

At the 2000 census there were 2,978 people in 1,017 households, including 755 families, in the city.