Jefferson information on the site is deemed reliable, but not guaranteed. Our Jefferson stats, Jefferson census, and Jefferson information is aggregated from many different sources and may be dated. Currently, we have thirty-two Jefferson foreclosures of sixteen thousand nine hundred ninety Jefferson, Illinois housing units housing units, of which fifteen thousand three hundred seventy-four are occupied, eleven thousand four hundred sixty-four are owner occupied, three thousand nine hundred ten are rented, one thousand six hundred sixteen are vacant, and four thousand seventy-two have mortgages. has fifteen thousand three hundred seventy-four households, and forty thousand forty-five citizens.