Mercer County, Illinois

Mercer County
Mercer County Courthouse
Map of Illinois highlighting Mercer County
Location within the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location within the U.S.
Coordinates: 41°12′N 90°44′W / 41.2°N 90.74°W / 41.2; -90.74
Country United States
State Illinois
FoundedJanuary 13, 1825
Named forHugh Mercer
SeatAledo
Largest cityAledo
Area
 • Total569 sq mi (1,470 km2)
 • Land561 sq mi (1,450 km2)
 • Water7.5 sq mi (19 km2)  1.3%
Population
 (2020)
 • Total15,699
 • Estimate 
(2021)
15,582
 • Density28/sq mi (11/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional districts15th, 17th
Websitewww.mercercountyil.org

Mercer County is a county in Illinois. According to the 2020 census, it had a population of 15,699.[1] Its county seat is Aledo.[2]

Mercer County is included in the Davenport-Moline-Rock Island, IA-IL Metropolitan Statistical Area.[3]

  1. ^ "Mercer County, Illinois". United States Census Bureau. Retrieved June 10, 2023.
  2. ^ "Find a County". National Association of Counties. Retrieved June 7, 2011.
  3. ^ United States Office of Management and Budget. "Update of Statistical Area Definitions and Guidance on Their Uses" (PDF). pp. 5, 36. Archived from the original (PDF) on May 14, 2006. Retrieved July 21, 2006.

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