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 Courthouse
Logan County courthouse in Lincoln, Illinois, circa 1901-1907
Tazewell County is a county in the U.S. state of Illinois. According to the 2020 census, it had a population of 131,343. Its county seat and largest city is Pekin. It is pronounced with a short "a", to rhyme with "razz" rather than "raze."