As of the 2010 census, the United States Commonwealth of Kentucky had an estimated population of 4,339,367, which is an increase of 297,174, or 7.4%, since the year 2000. Approximately 4.4% of Kentucky's population was foreign-born as of 2010. The population density of the state is 107.4 people per square mile. The center of population of Kentucky is located in Washington County, in the city of Willisburg.