Favorite City of Middleton Address: PO Box 487, Middleton, Idaho, 83644, United States 208-585-3133 Contact form ProfilePhotosMap Profile Middleton is a city in Canyon County, Idaho, United States. The population amounted to 9,091 at the 2021 census estimate, 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 Photos Map Loading... No Records Found Sorry, no records were found. Please adjust your search criteria and try again. Maps failed to load Sorry, unable to load the Maps API. Enter your locationGet Directions Travel modeDrivingWalkingBicyclingPublic Transport Distance unitsMilesKilometers CONTACT US Wendy Miles 208-585-3133 Citmid@middletoncity.com Website ADDRESS PO Box 487 Middleton Idaho United States 83644 Get Directions Contact form