Gillette is located in Northern Campbell County, in the northeast corner of Wyoming. It is located on the plains between the Black Hills of South Dakota and the Big Horn Mountains of Wyoming. It has nine elementary schools, two junior high schools, and a high school with a split campus. There is also an alternative high school.
Campbell County High School is a comprehensive public high school with a present enrollment of 1,424 students in grades 10-12. The class of 2015 has 450 students.