Welcome to Mercer County

Mercer County is located along U.S. Highway 67 and State Highways 17 and 94 in the U.S. state of Illinois. The Mississippi River is located along the western border of Mercer County and is part of the Yellowbanks Territory, named by the Sauk and Fox Indians because of the yellow, sandy soil along the riverbank. Named after Revolutionary War hero General Hugh Mercer, Mercer County was chartered in 1835 as part of the old Northwest Territory and the Military Tract. As of 2010, the population was 16,434 a drop of 523 from 2000. The county seat is Aledo. Mercer County is one of the four counties that make up the Davenport-Moline-Rock Island Metropolitan Statistical Area.

View of the Mississippi River in New Boston, IL


Agendas and Minutes for Committee & Board Meetings, as well as public forms and documents are posted on the Documents page.

Law Enforcement Agendas can be found on the Mercer County Sheriff's Office website.


Public Act

Per Public Act 97-0609, an amendment to the Open Meetings Act 5ILCS 120/7.3, it is the duty of all Illinois Municipal Fund Employers to post information for each employee having a total compensation package that exceeds $75,000.00 per year. This package is to include salary, health insurance, vacation and sick days granted.

These include:

  • States Attorney Meeghan Lee , $134,563.82
  • Public Defender Dan Dalton, $91,500.00






Public Transportation

Mercer County Public Transportation


November 3, 2020 General Election - Unofficial Results and Unofficial Results by Precinct

11/03/2020 General Election Canvass -- OFFICIAL RESULTS


April 2021 Consolidated Election

Nomination packets are available on the Documents page.  Click on Elections and 2021.  Packets can be turned in to the County Clerk's office December 14th - 21st.



The Mercer County Highway Department is requesting Statements of Interest from engineering firms to provide construction inspection services for a roadway improvement project scheduled for the summer of 2021.

Firms will be evaluated based on specific experience in pavement cement stabilization procedures, determination of intermediate bearing values and nuclear density certification.

Statements of Interest should be mailed to the Mercer County Highway department Attn: County Engineer PO Box 167 Aledo IL 61231.

The deadline for Statement of Interests submittals is December 16th 2020.


The Courthouse is open to the public.  Masks are required and social distancing guidelines are being followed.  County offices can be found by clicking COVID-19 information.  Thank you for your cooperation and understanding during this time.



The Mercer County Probation office has an opening for a probation officer.  See job description.  The deadline for applying is Monday, November 30, 2020.





Mercer County Treasurer office: Bev Lower

Tax Records can be searched online at merceril.devnetwedge.com

ALL property tax information can be found on the website.  (To search) less is best just a last name or house # and town


Auction Information and Book

Please contact the Treasurer's Office with questions.

For 2019 Payable 2020 Property Tax Sale information see the Treasurer page of the website.

Due to Coronavirus, the County Collector's office is not taking in-house/counter

payments at the Courthouse this year.

Please see the Treasurer's page to see payment options.

If you need to come in, please call (309)582-2524 to make an appointment or email    lower@mercercountyil.org OR kris@mercercountyil.org, a mask will be required if you come into the office.

Please feel free to contact my office with any questions, we will assist you in any way we can.  Use our website for any new information, you can also access your property taxes online from our website and print your bill.

Thank you!  Stay safe, keep your families safe, and continue social distancing as long as possible.

Mercer County Treasurer Bev Lower




Please Note that Zoning Board of Appeals meetings are held in the Board Room at the Mercer County Courthouse, 100 SE 3rd Street, Aledo, IL  61231





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