39 homes have sold in Mercer County so far this year. The Illinois Association of REALTORS data shows the median sales price at $90,000. Last year at this time, 43 homes had sold with an average sales price of $80,000. During the most recent month of May, 7 homes sold with a median sales price of $120,000. There are 93 homes for sale currently in Mercer County and this year on avearge, it is taking 82 days on the market until sale.