Logan County, Illinois

Logan County
Logan County Courthouse
Location within the U.S. state of Illinois
Illinois's location within the U.S.
Coordinates: 40°08′N 89°22′W / 40.13°N 89.36°W / 40.13; -89.36
Country United States
State Illinois
FoundedFebruary 15, 1839
Named afterJohn A. Logan
SeatLincoln
Largest cityLincoln
Area
  Total
619 sq mi (1,600 km2)
  Land618 sq mi (1,600 km2)
  Water0.9 sq mi (2 km2)  0.1%
Population
 (2020)
  Total
27,987
  Estimate 
(2021)
27,992
  Density45/sq mi (17/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district15th
Websitelogancountyil.gov/index.php?lang=en

Logan County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 27,987. Its county seat is Lincoln.

Logan County comprises the Lincoln, IL Micropolitan Statistical Area, which is included in the Springfield-Jacksonville-Lincoln, IL Combined Statistical Area.