Paying by Mail

Due dates for 2024 Real Estate Taxes, payable in 2025 are as follows:

  • 1st Installment: Wednesday, June 18, 2025.

  • 2nd Installment: Monday, August 18, 2025.

  • 3rd Installment: Thursday, September 18, 2025.

  • 4th Installment: Tuesday, November 18, 2025.


Payments by Mail

  • Taxes paid by mail should be accompanied by the applicable stub or stubs that agree with your payment. (Keep the larger portion of the statement for your records).

  • Mail your check or money order, made payable to the County Collector, and applicable stub or stubs to:
    Rock Island County Collector
    PO Box 3277
    Rock Island, IL 61204-3277

  • Your canceled check will serve as your receipt when paying by mail. You can also view records of payments online by searching your property information on the Devnet wEdge tool. Click here to view the disclaimer and use the Devnet wEdge tool.

  • Persons paying with cash must pay in-person and will receive a receipt.

  • Taxes not paid or postmarked by the due dates are subject to interest penalty.

  • Under state law, only U.S. postmarks (not metered dates) may be used to determine whether payments are timely and to determine whether penalties are due.

  • Payments may be returned if they lack adequate information for processing, such as the original payment stub or a check for an incorrect amount.

  • Neither failure to receive a tax statement, nor receiving one late will relieve the taxpayer from paying the taxes or any penalties which may become due.

  • Installments equal to at least one-fourth the total tax are due on or before the due dates shown on the front of the tax bill, or the full tax may be paid by the first installment due date.

  • State law requires the installments not paid by the due dates shall have interest added at the rate of 1.5% per month or part of a month until paid, sold, or forfeited.

  • No second notice will be mailed covering your second, third, and/or fourth installment, as all four stubs are included with your original tax bill.

  • Payments by mail are also accepted for mobile home taxes.

  • Payments received in the Treasurer's Office after Tuesday, November 18, 2025, must be paid only by cash, cashier's check, certified check or money order (no personal/business checks or debit/credit cards or mobile wallets are accepted after this date).

  • The last day that property tax payments will be accepted is December 29, 2025. Taxes not paid by December 29, 2025, will be sold at the Tax Sale on December 30, 2025.

Please contact the Rock Island County Treasurer's Office at 309-558-3510 if you have any questions.