Paducah and Chillicothe, Missouri, are the only two cities named in the World-famous song "Hooray for Hollywood", which opens the Academy of Motion Picture Arts and Sciences Awards yearly (the Oscars). (Both cities' names were misspelled in the original published lyrics to the song.) Paducah is the largest city in Kentucky's Jackson Purchase Region and the county seat of McCracken County, Kentucky, United States. It is located at the confluence of the Tennessee River and the Ohio River, halfway between the metropolitan areas of St. Louis, Missouri, to the west and Nashville, Tennessee, to the east. The population was 27,024 at the 2010 census. Twenty blocks of Downtown Paducah have been placed on the National Register of Historic Places.