Lee's Summit is a city in the U.S. state of Missouri and is a suburb in the Kansas City metropolitan area. It resides in Jackson County (predominantly) as well as Cass County. As of the 2020 census, its population was 101,108, making it the 6th most populous city in both Missouri and the Kansas City metropolitan area.

The Kansas City metropolitan area is a bi-state metropolitan area anchored by Kansas City, Missouri. Its 14 counties straddle the border between the U.S. states of Missouri and Kansas. With 8,472 square miles (21,940 km2) and a population of more than 2.2 million people, it is the second-largest metropolitan area centered in Missouri and is the largest metropolitan area in Kansas, though Wichita is the largest metropolitan area centered in Kansas. Alongside Kansas City, Missouri, these are the suburbs with populations above 100,000: Overland Park, Kansas; Kansas City, Kansas; Olathe, Kansas; Independence, Missouri; and Lee's Summit, Missouri.