There are 114 counties in the state of Missouri. The United States Census Bureau provides a list of all the state's counties, complete with demographic information. In terms of population, the largest county is St Louis and the smallest Worth.
Missouri's state capital is Jefferson City, and its most populous city is Kansas City. The state was the 24th to be admitted to the union, gaining admission on August 10, 1821. The state occupies 69,704 square miles, making it the 21st largest in the United States. Census data from 2014 gives an estimated population of 6,063,589, of whom just over a million live in the county of St Louis.