The Twin City Chapter is located in Bloomington-Normal, Illinois. Bloomington and Normal are sister cities located in Central Illinois along I-55 between Chicago and St. Louis. The combined population is approximately 150,000 (and growing!!).

Bloomington is home to several insurance companies, including the corporate headquarters for State Farm Insurance and Country Insurance & Financial Services. It is also home to Mitsubishi Motor Manufacturing of America and the Eureka Company. Illinois Wesleyan University and Illinois State University also call this area home.