The campus is located on 23 acres (93,000 m2) in the Wimbledon subdivision off Perkins Road in South Baton Rouge. The school has a total of 89 classrooms. The Lower School Complex consists of 30 classroom spaces, a library, a music studio and an art studio. The Brown-Holt Chapel Arts Center is the central hub for artistic expression at the school. The school's weekly chapel services take place here as well as the yearly fine art performances. Brown-Holt contains the Dunham Family chapel auditorium, two art studios, a black box theatre, as well as the band and choir studio spaces. The campus also includes a 12,000 square foot athletic center, weight and training rooms, baseball and softball fields, Lower and Middle School gymnasium, Upper School gymnasium, golf practice facility with putting green, football and soccer complex, and an indoor baseball practice facility. The McKay Academic Center (MAC) focuses on specialized learning for students that learn differently. The MAC hosts eleven classrooms itself.
For the 2020–2021 school year there are 91 faculty and 37 staff members and 761 enrolled students: 282 in the Upper School, 226 in the Middle School, and 253 in the Lower School.
Athletics
The Dunham School athletics competes in the LHSAA.