Louis) and is the largest metropolitan area in Kansas, though Wichita is the largest metropolitan area with its 1950s dominant historic core city in Kansas. With 8,472 square miles (21,940 km 2) and a population of more than 2.2 million people, it is the second-largest metropolitan area with its 1950s dominant historic core city in Missouri (after Greater St. states of Missouri (9 counties) and Kansas (5 counties) having its core in both states. Its 14 counties straddle the border between the U.S. The Kansas City metropolitan area is a bi-state metropolitan area containing Kansas City, Missouri, although Johnson County, Kansas, is its largest employer and most densely populated county.