Carlton J. Kell High School is a public high school in the Cobb County School District in the US state of Georgia. The school is located in Marietta, just northwest of Atlanta. The school was founded in 2002 and serves students in the Cobb County area. It is also an Advanced Placement Certified School. The school mascot is the Longhorn, and the school colors are copper, black, and white. An Advanced Placement certified school, Kell hosts 1,818 students. The school has 411 staff and faculty, 157 of whom are teachers. As of 2015 the principal is Dr. Andy Bristow. Among Kell's rivals are Lassiter High School and Sprayberry High School.