Select a county from the map for more information or see the counties summary. Relief and physiographic maps are also available. Kentucky is located in the central United States. In 1990 it had a population of 3, 685, 296 in an area of 40, 395 square miles, an average of 91 people per square mile. The capital of Kentucky is Frankfort. Search the Gazetteer by the name of a place or feature: More ...