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.