Kansas City is a city that is located in both the state of Missouri and the state of Kansas. However, the largest city with the name Kansas City is located in Missouri. The city is situated at the border of Kansas and Missouri, and it is the central city of the Kansas City metropolitan area. The city was founded in the 1830s as a port on the Missouri River at its confluence with the Kansas River from the west. The city is located in Jackson County, but a small part of the city is in Platte, Cass, and Clay Counties. As of the 2020 census, the population of Kansas City, Missouri was 508,090, making it the 37th most-populous city in the United States.