Mount Pulaski is a city in Logan County, Illinois, United States. The population was 1,566 at the 2010 census, and 1,481 at a 2018 estimate. It is the home of the Mount Pulaski Courthouse State Historic Site. The city is named in honor of Polish Revolutionary War hero Casimir Pulaski. Mount Pulaski has one high school: Mount Pulaski High School, home of the Hilltoppers. The school colors are purple and gold. Mount Pulaski held the county seat of Logan County from 1848 to 1855.

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.