Bonita Springs is a city in Lee County, Florida, United States. The population was 53,644 at the 2020 census, up from 43,914 at the 20…Bonita Springs is a city in Lee County, Florida, United States. The population was 53,644 at the 2020 census, up from 43,914 at the 2010 census. It is part of the Cape Coral-Fort Myers, Florida Metropolitan Statistical Area, on the state's southwest coast.