Northbrook, IL Prices for Houses for Sale AVERAGE 835,187 -0% MEDIAN 569,500 -9% Relative Price (per sqft.) PRICE Listings of Northbrook Homes for Purchase ACTIVE 122 -22% NEW 100 -26% Market Duration of Homes Sold DAYS 34 -9% Local Statistics Population 32,657 (-0.01%) House Size (sqft.) 2,463 (-5.76%)