Kevin Koenigstein
Treasurer

Appointed 2008

Elected 2010

Republican

Phone:  (618) 939-8681 ext 213

Software:  Fike & Fike

Population:  33,722

Zone:  I

Welcome to Monroe County, Illinois. 

The 2025 Monroe County real estate tax bills that are payable in 2026 were mailed June 25, 2026.

The first installment will be due on September 18, 2026 and the second installment will be due on November 6, 2026.  

Current tax bills are now available on-line at www.monroecountyil.gov.

The tax sale date will be scheduled for January 14, 2027 for unpaid taxes.

Office Hours:

• Monday - Friday 8:00 - 4:30.

Holiday Closings:

July 4th -  July 3, 2026

Labor Day - September 7, 2026

Due Dates for 2025 taxes payable in 2026

1st Installment - September 18, 2026

2nd Installment -  November 6, 2026

Tax Sale Date - January 14, 2027

Tax Software: Fike and Fike

Contact Information:

• Property Tax..............(618) 939-8681 ext 213
• Email.........................kkoenigstein@monroecountyil.gov
• County Website........www.monroecountyil.gov
• Office Staff
  • Treasurer: Kevin W Koenigstein
  • Tax Deputy: Dawn
  • Tax Deputy: Chris

Our Location:

Monroe County Treasurer’s Office

100 S. Main

Waterloo, IL 62298