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


Harvest Season Emergency Declaration 9/1/2018 through 12/31/2018
During the Harvest Season Declaration Period, Mercer County is waiving the written permit requirements and per 625 ILCS5/15-301(e-1) allowing vehicles involved in harvesting operations to exceed the maximum axle weight and gross weight limits by 10% for County Highways under the Jurisdiction of Mercer County.  This emergency declaration does not apply to roadways and bridges that are load posted thru out the county.
Harvest Season Emergency
Just this morning, Governor Rauner formally declared a harvest emergency for this fall.  That requires the State to issue permits for loads of farm commodities up to 10 percent over normal weight limits and authorizes local road jurisdictions to do the same.
The permits may now be issued through the end of 2018.  Farmers will have to check with each road jurisdiction on whose roads they intent to operate the heavier loads to request the permit.  Because of new legislation passed this year, these permits will be made available in 2019 without awaiting the formality of a Governor’s declaration.
The permits are available as of September 10, 2018 from IDOT using its online ITAP electronic permitting system.  Local jurisdictions might take a little more time to get up to speed, but they are authorized at that level now, too. 
Harvest commenced in many areas of the state this week but the rains that have arrived will certainly slow or shut it down for a while. As you crank up again when things dry out,  stay safe.
But 2018 will be the last Harvest Emergency because now a special permit may be issued from Sept 1 – Dec 31 to allow vehicles to be 10% over the maximum weight limits. (HB 5749)





Public Transportation

Mercer County Public Transportation


General Election - November 6, 2018

Click HERE for Official Canvass results



School Board packets for the April 2, 2019 Consolidated Election are available HERE.  Packets are to be filed with in the County Clerk's office December 10th through December 17th, 2018.






The Mercer County Probation Dept is currently seeking a Probation Officer.  Please click on job description for full details.






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


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 in the Board Room at the Mercer County Courthouse, 100 SE 3rd Street, Aledo, IL  61231





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