Louisville (ⁱ/ˈluːiːvɪl/, local ⁱ/ˈluːəvəl/ or ⁱ/ˈlʌvəl/) is the largest city in the U.S. state of Kentucky, and the county seat of Jefferson County. Since 2003, the city's borders have been coterminous with those of the county because of a city-county merger. The city's population at the 2010 census was 741,096 (consolidated; balance total is 597,337). An important internal shipping port in the 19th century, Louisville today is best known as the location of the Kentucky Derby, the first of three annual thoroughbred horse races making up the Triple Crown.