The St. Louis metropolitan area has a population of nearly 2.5 million people, spaning eight counties in Missouri and Illinois. These include the City of St. Louis, Jefferson, Franklin, St. Charles and St. Louis counties in Missouri; Madison, Monroe, and St. Clair counties in Illinois.

State of Missouri	Visit Missouri	State of Illinois
St. Louis City, MO St. Louis County, MO St. Charles County, MO	Franklin County, MO Jefferson County, MO	St. Clair County, IL Madison County, IL Monroe County, IL

St. Louis City, MO University City, MO Ballwin, MO Chesterfield, MO Kirkwood, MO Manchester, MO Maplewood, MO Maryland Heights, MO Webster Groves, MO

St. Charles, MO O' Fallon, MO Wentzville, MO Augusta, MO Lake Saint Louis, MO St. Peters, MO Washington, MO Arnold, MO

Alton, IL Belleville, IL Swansea, IL Waterloo, IL Columbia, IL Cahokia, IL Fairview Heights, IL Millstadt, IL