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 , $137,469.84
  • Public Defender Dan Dalton, $91,500.00






Public Transportation

Mercer County Public Transportation


General Primary - March 20, 2018  


To view the official election canvass results click HERE.

To view the official election results broken down by party and precinct click Republican or Democratic.









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

2017 Payable 2018 Property Tax due dates are June 29th and September 7th, 2018.

To pay your property taxes online, go to the "Departments" tab at the top of this page and click on "Treasurer".  Then, click on the "Pay Property Taxes Here" link on the Treasurer's page.


Mercer County Illinois Bi-Centennial Committee
2018 marks Illinois 200th Birthday and there will be year-long celebrations commemorating this milestone.  In order to make this a success, Mercer County is forming a Committee to work directly with the office of the Governor.  This is strictly a volunteer effort and there is no compensation nor will public funds be expended.  If interested in serving, please fill out the Appointment Application.pdf found here and return as indicated on the form.
Successful candidates will have experience in one or more of these areas:  Grant writing, event planning, fund raising, community organizing, or local history.


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





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