Poplar Hills, KY has a population of 412 and is the 20,711th largest city in the United States. The population density is 16,161 per sq mi which is 14808% higher than the Kentucky average and 17737% higher than the national average. The median age in Poplar Hills is 28 which is approximately 28% lower than the Kentucky average of 39. In Poplar Hills, 30% of the population over 15 years of age are married, 68% speak English and 31% speak Spanish. 51% of Poplar Hills residents were born in Kentucky, 28% were born out of state, 2% were born outside of the United States and 19% were foreign born.