MidAmerica St Louis Airport is located in Mascoutah, Illinois in St Clair County. Conveniently located near St Louis, Mo and communities on the Metro East Illinois side, MidAmerica St Louis Airport provides cargo services that will meet your needs. MidAmerica offers national and international cargo from a strategic mid-continent location. Many answers to your questions can be found within our site. If for any reason you are still having trouble locating answers please forward your questions and/or comments.