Milford is a city in Geary County, Kansas, United States. As of the 2020 census, the population of the city was 408. Milford was originally call…Milford is a city in Geary County, Kansas, United States. As of the 2020 census, the population of the city was 408. Milford was originally called Bachelder, and under the latter name was laid out in 1855. Milford contained a lumber mill in its early days.