Manhattan is a city in northeastern Kansas in the United States at the junction of the Kansas River and Big Blue River. It is the county seat of Riley County, although it extends into Pottawatomie County. As of the 2010 census, the city population was 52,281. The city was founded by settlers from the New England Emigrant Aid Company as a Free-State town in the 1850s, during the Bleeding Kansas era. Nicknamed "The Little Apple" as a play on New York City's "Big Apple", Manhattan is best known as the home of Kansas State University and has a distinct college town atmosphere. Manhattan Regional Airport (MHK) is the second-busiest commercial airport in Kansas. Eight miles (13 km) west of the city is Fort Riley, a United States Army post.