Of the 72,731 listings on the market in all nine Chicagoland counties in 2011, 388 of those listings, or 0.53 percent, were co-ops. Of Cook County’s 39,358 listings, the co-op percentage was higher, with 352, or 0.89 percent. In addition, all luxury co-ops, with a listing price above $1 million, were in Cook County. Midwest Real Estate Data (MRED) compared the number of co-ops on the market in 2011, the average sold price, maximum sold price and total sales volume for all nine Chicagoland counties to Cook County.

Midwest Real Estate Data (MRED) is the real estate data aggregator and distributor providing the Chicagoland multiple listing service (MLS) to nearly 8,000 real estate offices and 40,000 real estate professionals, including brokers, agents and appraisers. MRED has expanded well into the “collar” counties surrounding Chicagoland, and its property information encompasses northern Illinois, southern Wisconsin and northwest Indiana.