Wichita, the state’s largest city, is known locally as the Air Capital of the World because of its longtime status as a major centre of production for general-aviation aircraft. Wichita, the largest city, has the state’s largest buildings, biggest industries, and most-venturesome businesses. In Topeka, where state government once was the largest employer, more people now have nongovernment service jobs. Kansas City, Kan., is contiguous with its larger neighbour, Kansas City, Mo., and contains a significant part of the industrial complex of that region, as does neighbouring Johnson county. Overland Park, in Johnson county, was incorporated as a city only in 1960 but by the end of the 20th century had overtaken even Kansas City in population; several large corporations are based there. Leavenworth, the state’s oldest city, is built around government institutions, including an army post at Fort Leavenworth, a federal prison, a state penitentiary (in the bordering city of Lansing), and a veterans’ hospital. Lawrence, home of the state’s largest university, depends on the school for its economy, though the city has worked successfully to attract high-technology and light-manufacturing industry. Most of the other cities depend on farm trade and agriculture-related business.