Poplar Hills is a neighborhood of Louisville, Kentucky, United States. It is part of Louisville Metro government but separately incorporated as a 6th-class city. It is the only incorporated municipality in Kentucky with a majority African-American population. The population was 396 at the time of the year 2000 U.S. Census. It currently has the highest population density for any city in Kentucky, and is the only Kentucky city that is on the highest population densities of American cities list. It currently ranks 74th on the list, and has the lowest population for any city on that list.