WGCA-FM serves an area of Missouri with what population?
Hannibal, Missouri Hannibal is a city in Marion and Ralls counties in the U.S. state of Missouri. Interstate 72 and U.S. Routes 24, 36, and 61 intersect in the city, which is located along the Mississippi River approximately 100 mi northwest of St. Louis. According to the 2010 U.S. Census, the population was 17,606, making it the largest city in Marion County.
Centralia, Missouri Centralia is a city in Audrain and Boone counties in the U.S. state of Missouri. The population was 4,027 at the 2010 census, with an estimated population of 4,136 in 2012.