Lemont, IL Prices for Houses for Sale AVERAGE 588,463 -5% MEDIAN 500,000 -7% Relative Price (per sqft.) PRICE Listings of Lemont Homes for Purchase ACTIVE 45 -41% NEW 48 -8% Market Duration of Homes Sold DAYS 30 -22% Local Statistics Population 17,338 (0.00%) House Size (sqft.) 2,374 (-4.47%)