The ticket was purchased at a Citgo gas station in Glenwood.
It was the only one to match all five numbers and the Mega Ball in Friday night's drawing.
The ticket holder isn't the only winner. The owner of that gas station will also get a prize.
The winning numbers were 4, 11, 21, 42 and 53.The Mega Ball number was 38.
Two other people in Illinois matched the first five numbers for a $250,000 prize.