Templeton is a city in Carroll County, Iowa, United States. The population was 352 at the time of the 2020 census. Templeton was platted in 18…Templeton is a city in Carroll County, Iowa, United States. The population was 352 at the time of the 2020 census. Templeton was platted in 1882. The city was probably named for a railroad worker. The city was incorporated on September 28, 1883.