Illinois

Overview

• Population: 12,419,293 (Change since 1990: +8.6%)
• Statehood: Dec. 3, 1818
• Capital city: Springfield
• Highest point: Charles Mound, 1235 ft.
• Lowest point: Fort Defiance, 279 ft.

Counties

• Alexander County
  • Population: 9,590 (Change since 1990: -9.7%)
  • Created: March 4, 1819
  • County seat: Cairo
  • Largest town: Cairo (Pop. 3,632)
  • Name origin: William M. Alexander
• Gallatin County
  • Population: 6,445 (Change since 1990: -6.7%)
  • Created: September 14, 1812
  • County seat: Shawneetown
  • Largest town: Shawneetown (Pop. 1,410)
  • Name origin: Albert Gallatin
• Hardin County
  • Population: 4,800 (Change since 1990: -7.5%)
  • Created: March 2, 1839
  • County seat: Elizabethtown
  • Largest town: Rosiclare (Pop. 1,213)
  • Name origin: Hardin County, Kentucky
• Jackson County
  • Population: 61,296 (Change since 1990: +0.4%)
  • Created: January 10, 1816
  • County seat: Murphysboro
  • Largest town: Carbondale (Pop. 20,681)
  • Name origin: Andrew Jackson
• Johnson County
  • Population: 12,878 (Change since 1990: +13.5%)
  • Created: September 14, 1812
  • County seat: Vienna
  • Largest town: Vienna (Pop. 1,234)
  • Name origin: Richard M. Johnson
• Massac County
  • Population: 15,161 (Change since 1990: +2.8%)
  • Created: March 3, 1843
  • County seat: Metropolis
  • Largest town: Metropolis (Pop. 6,482)
  • Name origin: Fort Massac
• Pope County
  • Population: 4,413 (Change since 1990: +0.9%)
  • Created: January 10, 1816
  • County seat: Golconda
  • Largest town: Golconda (Pop. 726)
  • Name origin: Nathaniel Pope
• Pulaski County
  • Population: 7,348 (Change since 1990: -2.3%)
  • Created: March 3, 1843
  • County seat: Mound City
  • Largest town: Mounds (Pop. 1,117)
  • Name origin: Casimir Pulaski
• Randolph County
  • Population: 33,839 (Change since 1990: -2.2%)
  • Created: October 5, 1795
  • County seat: Chester
  • Largest town: Chester (Pop. 5,185)
  • Name origin: Edmund Randolph
• Saline County
  • Population: 26,733 (Change since 1990: +0.7%)
  • Created: February 25, 1847
  • County seat: Harrisburg
  • Largest town: Harrisburg (Pop. 9,860)
  • Name origin: Saline Creek
• Union County
  • Population: 18,293 (Change since 1990: +3.8%)
  • Created: January 2, 1818
  • County seat: Jonesboro
  • Largest town: Anna (Pop. 5,136)
  • Name origin: Federal union
• Williamson County
  • Population: 61,296 (Change since 1990: +6.2%)
  • Created: February 28, 1839
  • County seat: Marion
  • Largest town: Marion (Pop. 16,035)
  • Name origin: Williamson County, Tennessee

History

Demographics