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