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

Public Transportation

Mercer County Public Transportation



2016 CANDIDATES GUIDE located in Public Documents



The Mercer County Board is accepting applications for 


Applications can be submitted to Phyllis Bewley, Mercer County Clerk.


The Mercer County Sheriff is accepting applications for 


Applications can be picked up at the Sheriff's Office or online by clicking on the link below to the Sheriff's webpage  Deadline is 5-20-16




Important Property Tax Due Dates

Taxpayers can expect to receive a tax bill by the 2nd week in May.  If you do not receive a tax bill call the Treasurer's Office (309)582-2524. WARNING:  FAILURE TO RECEIVE A BILL WILL NOT NEGATE YOUR TAX LIABILITY.   First Installment due by June 10, 2016.  Second Installment due by September 9, 2016 .

For further information click here.


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



The above policy was adopted by the Mercer County Board on November 6, 2014 and was immediately put into effect.  Please note the changes and adjust your driving habits accordingly. 





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