Illinois Counties
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Illinois Counties

There are one hundred and two counties in Illinois. St. Clair County was the first county established in what is today Illinois. Most counties in Illinois were named after early American leaders, especially of the American Revolutionary War, as well as soldiers from the Battle of Tippecanoe and the War of 1812.

Stephenson County, Illinois

Stephenson County Education, Geography, and HistoryStephenson County, Illinois Courthouse

Stephenson County is a county located in the state of Illinois. According to the 2010 census, it had a population of 47,711.  Stephenson County was created on March 4, 1837. The county seat is Freeport. The county is named for Benjamin Stephenson (1769-1822), representative of Illinois Territory in the United States Congress from 1814 to 1816.

Stephenson County is included in the Freeport, IL Micropolitan Statistical Area, which is also included in the Rockford-Freeport-Rochelle, IL Combined Statistical Area.

Etymology - Origin of Stephenson County Name

The county is named for Colonel Benjamin Stephenson, Adjutant General of the Illinois Territory (1813-1814).


County QuickFacts: CensusBureau Quick Facts

Stephenson County History

Stephenson County was created on March 4, 1837 (Laws, 1837, p. 96) and was formed from Jo Daviess and Winnebago Counties. Present area, or parts of it, formerly included in: JoDaviess County (1826-1837), Winnebago County (1836-1837), Putnam County (1825-1826), Fulton County (1823-1825), Pike County (1821-1823), Bond County (1817-1821), Madison County (1812-1821) and St. Clair County (1801-1812).

The County was named for Benjamin Stephenson, prominent pioneer, a Colonel of the Territorial militia, and Adjutant General of the Territory (1813-1814). The County Seat is Freeport (1837-Present).

Geography: Land and Water

As reported by the Census Bureau, the county has a total area of 565 square miles (1,463 km2), of which, 564 square miles (1,461 km2) of it is land and 1 square miles (1 km2) of it (0.10%) is water.

Stephenson county is located in north Illinois. Lake Le-Aqua-Na State Park is located in this county.

Neighboring Counties

Bordering counties are as follows:

  • North: Green County, Wis.
  • East: Winnebago County
  • Southeast: Ogle County
  • Southwest: Carroll County
  • West: Jo Daviess County
  • Northwest: Lafayette County, Wis.


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