Mackey, IowaMackey is an unincorporated community in Boone County, in the U.S. state of Iowa.HistoryThe community was named after Sebastian Mackey, an early settler. Mackey was not officially platted. A variant name was "Mackey’s Grove". A post office called Mackeys Grove was established in 1870, the name was changed to Mackey in 1883, and the post office closed in 1905. Mackey's population was 25 in 1902, and 51 in 1925.