Slidell Independent School District is a public school district located in Slidell, Texas. SISD is made up of four counties; Cooke, Denton, Montague, and Wise. We serve 435 students in grades PreK through 12th. There are two campuses: Slidell Elementary and Slidell Secondary (Jr. High and High School). The district mascot is the Greyhound and our colors are Royal Blue and Orange. Slidell is classified as a 1A district in the UIL's latest realignment.