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 (9 counties) and Kansas (5 counties). 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 (after Greater St. Louis) 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.
Longtan District is one of the areas under the jurisdiction of Jilin City, Jilin Province, which gets its name because it is located in the foothills of Longtan. Located in the northeast of Jilin City, the north bank of Songhua River, Longtan District borders Jiaohe City in the east, Fengman District in the southeast, Changyi District in the south and west, and Shulan City in the north. Longtan District covers an area of 1208.9 square kilometers and cultivated land covers an area of 292.27 square kilometers. In 2010, the resident population was 527532, including more than 20 ethnic groups such as Han and Yao. In 2016, Longtan has jurisdiction over 13 streets, 5 towns and 1 township. In 2016, the GDP of Longtan District reached 39.75 billion yuan, an increase of 7 percent over 2015.