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
  • County Highway Engineer Jimmy Samaniego, $92,300.00

Public Transportation

Mercer County Public Transportation



Pursuant to Article 19A of the Illinois Election Code, Early Voting for the Consolidated Election for all Mercer County Precincts will be conducted at the temporary voting site at the Office of the Mercer County Clerk at the courthouse at 100 SE 3rd Street in Aledo beginning March 23, 2015 on weekdays from 8:00 a.m. until 4:00 p.m. through April 4, 2015.   In Person Absentee Voting continues from now until April 6, 2015.  Grace Period Voting will be from March 10 through April 4, 2015 at which time a voter may register and vote at the same time.  In addition the office will be open for In Person Absentee Voting, Grace Period and Early Voting on Saturday, April 4 from 8:00am  to 12:00 noon.  The Courthouse will be closed for Good Friday April 3.  Any voter validly registered in Mercer County may vote during the Early Voting period after showing proper identification, however, any vote cast is final, and may not be revoked, and the voter is not eligible to cast a vote on Election Day.


Job Opening

The Mercer County Board is seeking resumes for the position of COUNTY ADMINISTRATOR.

To see the ad 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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