About Mainstreet

Mainstreet Organization of REALTORS® is the largest local real estate association in the State of Illinois – and the 7th largest in the nation – representing more than 19,000 real estate professionals.

Mainstreet REALTORS® Members provide service to their clients in more than 200 Chicagoland communities distributed throughout DuPage, Lake, West and South Cook Counties. Since our founding as the DuPage Association of REALTORS® in 1921 – our continuing mission is to empower real estate professionals to thrive and find joy in their careers. We champion our members' goals with integrity, intelligence and inspiration.

Mainstreet Organization of REALTORS®

Main Number: 630.324.8400

Downers Grove

Headquarters :: 6655 Main Street, Downers Grove, IL 60516

Rolling Meadows

3701 Algonquin Road, Ste. 650, Rolling Meadows, IL 60008


1580 S. Milwaukee Avenue, Suite 312, Libertyville, IL 60048

Tinley Park

16345 S. Harlem Avenue, Suite 200, Tinley Park, IL 60477