Middleton is a city in Canyon County, Idaho, United States. The population was 9,091 at the 2021 consensus, up from 5,524 at the 2010 census and 2,978 in 2000. It is part of the Boise City–Nampa, Idaho Metropolitan Statistical Area. History 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. 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. The Ward Massacre occurred near the site in 1854. Middleton is the oldest settlement in Canyon County, with the land being parceled out in 1863 by William N. Montgomery. The Boise River flooded in 1872 and cut a new channel, isolating the town on an island; as a result, the town moved to a new location in the years after 1880. The town incorporated as a city in 1910, although the certificate was not issued until 1971. The present mayor is Steve Rule. On February 1, 2007, 78% of Middleton High School burned down, caused by the overheating of a fan above the weight room. The 42-year-old building was built when fire codes required sprinklers to be installed, but there was no provision for their functionality. To save money during the construction of the school in the 1960s, the sprinklers were installed but were never connected to a water source. Geography According to the United States Census Bureau, the city has a total area of , of which, is land and is water. Demographics 2010 census At the 2010 census there were 5,524 people in 1,843 households, including 1,392 families, in the city. The population density was . There were 2,037 housing units at an average density of . The racial makup of the city was 92.5% White, 0.3% African American, 0.6% Native American, 0.5% Asian, 0.1% Pacific Islander, 3.3% from other races, and 2.8% from two or more races. Hispanic or Latino of any race were 10.0%. Of the 1,843 households 49.5% had children under the age of 18 living with them, 54.7% were married couples living together, 13.6% had a female householder with no husband present, 7.2% had a male householder with no wife present, and 24.5% were non-families. 19.9% of households were one person and 7.1% were