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Poplar Hills is a home rule-class city in Jefferson County, Kentucky, United States. It is a part of the Louisville Metro government, but operates as a city under the Mayor to Commissioner form of government. Per the 2020 census, the population was 380. 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 19th on the list, and has the second-lowest population for any city on that list. It is tied with Mobile City, Texas, as the smallest city by total area on the list. [edit] Research Tips
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