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 (Appointed), $137,469.84
  • Public Defender Dan Dalton, $91,500.00

Public Transportation

Mercer County Public Transportation





Request for Statement of Interest

Engineering Services

For further information see specs




Needed:  Volunteers to serve on an at large position on the

TriCounty Waste Management Council.

For further information contact the Mercer County Clerk.




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



Change of Assessment will be published August 31, 2016

in The Times Record, Aledo, IL.







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