 The Ellis County portion is zoned to Donald T. Shields Elementary School, Red Oak Intermediate School, Red Oak Junior High School, and Red Oak High School.Glenn Heights is the only suburb (except for Cockrell Hill, which is technically an enclave and not a suburb) in the southern half of Dallas County that is a member of Dallas Area Rapid Transit; it has been since DART's inception in 1983.The Glenn Heights Park & Ride Center serves the city.