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Illinois Counties

There are 102 counties in the state of Illinois.

 

 

 
 

Mercer County, Illinois

Mercer County History, Geography, Demographics, Cities and Towns, and Education

 

County Seat: Aledo
Year Organized: 1825
Square Miles: 561
 
Court House:

100 SE 3rd Street
County Courthouse
Aledo, IL 61231-1948

Etymology - Origin of County Name

Gen. Hugh Mercer, killed at the Battle of Princeton during the American Revolution.

 

Demographics:

County QuickFacts: Census Bureau Quick Facts

History

Mercer County was created on January 13, 1825 (Laws, 1825, p. 93) and was formed from unorganized land (Pike County). County organization was completed in 1835. Present area, or parts of it, formerly included in: Attached to Warren County [Laws, 1831, p. 68.] (1831–1835), Attached to Peoria County [Laws, 1826, p. 76.] (1826–1831), Attached to Schuyler County [Laws, 1825, p. 95.] (1825–1826), Pike County (1821–1825), Madison County (1812–1821) and St. Clair County (1795–1812).

The County was named for Hugh Mercer, a General of the Revolution, killed at the battle of Princeton. The County Seat is Aledo . Prior County Seats was New Boston—Temporary designation (1835–1837), Millersburg (1837–1847), Keithsburg (1847–1857) and Aledo (1857–Present).
 

Geography

According to the U.S. Census Bureau, the county has a total area of 569 square miles (1,473 kmē), of which, 561 square miles (1,453 kmē) of it is land and 8 square miles (20 kmē) of it (1.38%) is water.
 

Neighboring Counties:
  • Northeast: Rock Island County; Henry County
  • Southeast: Knox County; Warren County
  • Southwest: Henderson County; Des Moines County, Iowa
  • West: Louisa County, Iowa
Cities and Towns:
- Abington township  
- Aledo (County Seat) city Incorporated Area
- Alexis village Incorporated Area
- Duncan township  
- Eliza township  
- Greene township  
- Joy village Incorporated Area
- Keithsburg city Incorporated Area
- Matherville village Incorporated Area
- Mercer township  
- New Boston city Incorporated Area
- North Henderson village Incorporated Area
- Ohio Grove township  
- Preemption township  
- Richland Grove township  
- Rivoli township  
- Seaton village Incorporated Area
- Sherrard village Incorporated Area
- Suez township  
- Viola village Incorporated Area
County Resources:

Enter County Resources and Information Here
 

 

 

Online High Schools

Online High Schools

 

 

 

County Resource Guide

Counties: US Map

The history of our nation can be seen as a prolonged struggle to define the relative roles and powers of our governments: federal, state, and local. And the names we've given our counties, our most locally based jurisdictions, reflects the "characteristic features of our country!"

But age, size and colorful names of our counties isn't the only reason to explore counties' role in American history, or the history of county government itself. In fact, the story of county government reflects the larger meanings of American history.

Today's counties are the most flexible, locally responsive and creative governments in the US. They are the most diverse, varying in size, population, geography, and governmental structure. In their politics and policies, they express a 1990's political slogan "Think globally, act locally."

 

 

 

 

 
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