Spring Hill is a city in Johnson and Miami counties in the U.S. state of Kansas, and part of the Kansas City Metropolitan Area. As of the 202…Spring Hill is a city in Johnson and Miami counties in the U.S. state of Kansas, and part of the Kansas City Metropolitan Area. As of the 2020 census, the population of the city was 7,952, and was estimated to be 9,242 in 2022.