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