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


March 17, 2020 General Primary Canvass


Independent Candidate Packet for 2020 General Election.  Petitions may be circulated for signatures beginning March 24th.  Packets need to be filed with the County Clerk from June 15th - June 22nd.  Please contact the County Clerk's office (309-582-7021) for signature requirements.


COVID-19 information for County Offices









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

I have opened up free tax bill printing since we are not currently open to the public.  Tax bills are on track to be mailed out the 1st part of May with a due date of the middle of June.  Hopefully, we will be open to the public by then. We are working @ 90% from home/10% in office on a rotating basis, but we are checking messages often.

You can still call and leave a message at (309)582-2524 and we will get back to you.  If you need to make an appointment to come in please email or leave a message.

You can also email any questions you have to:    lower@mercercountyil.org OR kris@mercercountyil.org

If you have a question about your exemptions, assessed value, or any changes to your property please contact the Assessor’s office at  (309)582-7814 or mercersoa@mercercountyil.org

Thank you and keep you and your family safe!  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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