Manchester is a city in Dickinson County, Kansas, United States. As of the 2020 census, the population of the city was 47. Manchester was origiā¦Manchester is a city in Dickinson County, Kansas, United States. As of the 2020 census, the population of the city was 47. Manchester was originally called Keystone, and under the latter name laid out in 1887. The name Manchester was adopted by 1890.