Frankfort, IL Prices for Houses for Sale AVERAGE 561,205 -8% MEDIAN 537,354 +0% Relative Price (per sqft.) PRICE Listings of Frankfort Homes for Purchase ACTIVE 51 -18% NEW 64 -6% Market Duration of Homes Sold DAYS 27 -16% Local Statistics Population 19,411 (0.00%) House Size (sqft.) 2,975 (-7.55%)