Mercer County

Mercer County is an administrative county in northwestern Illinois that encompasses agricultural land and multiple communities. The Mississippi River forms its western boundary and shapes the character of this region.

This county was established in 1825 and named after Hugh Mercer, a physician and general from the Revolutionary era. Early development was shaped by land grants given to military veterans.

Local communities gather for regular farming exhibitions and seasonal markets that showcase agricultural products and rural life. These events remain important meeting places where traditions connected to farming are passed along.

Administrative offices are located in Aledo and serve the county's residents with various services. The area is best explored by car since communities are spread across rural terrain.

The area was part of the Military Tract, a program that compensated veterans with land grants after early conflicts. This system shaped how the region was settled and developed.

Location: Illinois

Inception: January 13, 1825

Capital city: Aledo

Shares border with: Rock Island County, Henry County, Knox County, Henderson County, Warren County, Des Moines County, Louisa County

Website: http://mercercountyil.org

GPS coordinates: 41.20000,-90.74000

Latest update: December 7, 2025 20:41