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 Grace Simpson , $138,603.00
  • Public Defender Andrew Larson, $80,000.00






Public Transportation

Mercer County Public Transportation


April 2021 Consolidated Election

Unofficial Results - By Precinct / Election Summary




The Probation Office has an opening for a Probation Officer.  See job description for details.


The Highway Department has an opening for a Maintenance Worker.  See job description for details.  Please fill out a job application if interested.

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.








Mercer County Treasurer office: Bev Lower

Click the following link to be directed to the Treasurer's page: https://www.illinoistreasurers.org/treshome.php?idCounty=14066

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

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



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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