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Mount Pulaski is a city in Logan County, Illinois, United States. As of the 2020 census, Mount Pulaski had a population of 1,537. 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.