Middleton Real Estate View 177 listings HomeGuidesMiddleton About Middleton Idaho: Middleton is the oldest settlement in Canyon County, beating nearby Caldwell by 20 years. West of Eagle and north of Caldwell, Middleton is a small town within driving distance of the big city. Guides Garden CityWilderParmaMelbaHomedaleBoiseMeridianKunaEagleNampaCaldwellStarEmmettFruitlandMiddleton