Rock Island County tax bills and the December tax sale
The median Rock Island County homeowner pays about $3,425 a year in real estate taxes on a median home value of $150,400, according to Census survey data. That works out to roughly 2.3 percent of value each year. Your rate depends on your tax code. For the 2025 tax year, the City of Rock Island's base code carries a total rate of 10.1411 per $100 of equalized assessed value, and the county's 203 tax codes run from about 5.12 to 11.44. The 2025 taxes are billed in four installments, due June 10, Aug. 10, Sept. 10 and Nov. 10, 2026.
If an installment is still unpaid after the last due date, the Treasurer publishes the delinquency in the newspaper and a $10 fee is added. The Treasurer then holds a sale of unpaid taxes, once a year. Only the unpaid taxes are sold, not the house. The county then adds a $94 fee and a $160 redemption certificate fee plus penalty interest, and you get 2.5 to 3 years, set by the tax buyer, to redeem in full through the County Clerk. Township assessors value homes on a four-year cycle that runs 2023 through 2026, so the next general reassessment falls in 2027. The county will publish 2026 assessment changes on Sept. 26, 2026, and the last day to appeal is Oct. 26, 2026.
Foreclosure in the 14th Judicial Circuit
Every Illinois mortgage foreclosure goes through court. Here that's the 14th Judicial Circuit, which Rock Island County shares with Mercer, Whiteside and Henry counties, at the courthouse on 3rd Avenue in the city of Rock Island. The court opened 219 new foreclosure cases in 2023. For free help, GROWTH in Milan is a HUD-approved housing counseling agency that offers foreclosure-prevention counseling at no cost (309-794-6711).
For a Rock Island County owner, the dates count from the day you're served in a case filed at the 3rd Avenue courthouse. Catching up the missed payments and costs reinstates the loan if it's done within 90 days of that service. Paying off the whole balance stays open until 7 months after service or 3 months after judgment, whichever falls later, and closes once the sale happens. A 14th Circuit judge then has to approve the sale at a hearing, and the new owner can move in 30 days after the judge signs off. GROWTH's free counseling in Milan is one place to check your own dates, and the Illinois foreclosure timeline and deadline calculator lay out the steps.
Older river cities, newer villages and the Rock River floodplain
Rock Island County is the Illinois side of the Quad Cities, on the Iowa border. The Mississippi River wraps the county on the north and west, and the Rock River cuts through the middle. Moline is the largest city and Rock Island is the county seat, followed by East Moline, Silvis and Milan.
The market changes a lot as you move away from the river. The core cities along the river have the oldest houses and the most renters. Median home values there run from about $119,000 in Milan to $146,300 in Moline. The outer villages are newer and pricier, topping out at $278,200 in Port Byron.
Water matters here too. Homes line both the Mississippi and the Rock River, and in a mapped flood zone, flood insurance is required for federally backed loans, which can shape a buyer's financing. If a house sits near either river, pull its flood zone before you set a price.
What a $170,000 Rock Island County sale costs to list
Illinois REALTORS reports a median sale price of $170,000 for Rock Island County in the second quarter of 2026, up 4.7 percent from a year earlier, while closed sales fell 13.1 percent to 390. That's about half the statewide median of $335,000. Here's a rough look at what comes out of that price on a traditional listing:
- Agent commission at about 4.9 percent (Clever's Illinois average, updated September 2026): roughly $8,300
- Closing costs at about 1.2 percent: roughly $2,000
- State transfer tax at $0.50 per $500: about $170
That's roughly $10,500 before your mortgage payoff, repairs or holding costs. State law also lets a county add its own transfer tax, so ask the Recorder whether one applies here. If the property is a fit, a cash buyer may make an offer and you pick the closing date. Listing with an agent is also a fine choice, especially for a move-in-ready house. The pages on selling to stop a foreclosure and selling an inherited house cover those situations.
Rock Island County pages and the rest of the Quad Cities
Here's where to find local pages for Rock Island County and its neighbors.
- Rock Island: the county seat, median home value about $125,900
- Moline: the county's largest city, median home value about $146,300
- Henry County: also a $170,000 median in Q2 2026, same 14th Circuit
- Mercer County: shares the 14th Judicial Circuit with Rock Island County
- All Illinois pages: the statewide directory of county and city pages
Sources: Rock Island County, Real Estate Property Tax Payments; Rock Island County, Delinquent Taxes; Rock Island County tax rate report 2025; Rock Island County Assessment Office; Census Reporter, Rock Island County real estate taxes (B25103); Census Reporter, Rock Island County and places home values (B25077); Illinois Courts 2023 statistical summary; GROWTH; 735 ILCS 5, Article XV, Mortgage Foreclosure; 35 ILCS 200/31-10; Illinois REALTORS Q2 2026; Clever commission survey