Wolff's Flea Market is a family owned business, now celebrating its 25th anniversary. Since 1991, it has operated Sundays from April through October in Rosemont , Illinois. With the support of their parents, Katherine and Lawrence Wolff, sister Eileen, brothers Donald and David Wolff built Wolff's Flea Market into the premier family-friendly shopping destination for Chicagoland bargain shoppers and small business entrepreneurs. It boasts 700+ vendors and 12,000+ customers. Wolff’s has previously operated indoor markets in Mt. Prospect, Rolling Meadows and Melrose Park. In November 2009, Wolff’s opened its year-round Saturday/Sunday indoor market.