| School | Numbers | Detail |
| OPSU (Oklahoma Panhandle State University) | 800-644-6778 | Panhandle Branch |
| OSU Center for Health Sciences | 800-799-1972 | Health Science Center |
| OSU County Extension | 713-1125 | County Extension |
| OSU High School & College Rel | 945-3367 | FAX #405-945-3271 |
| OSU Office of Alumni | 800-433-4678 | FAX #405-744-6722 |
| OSU Okmulgee | 918-293-4678 | Okmulgee Branch |
| OSU Okmulgee | 800-722-4471 | Okmulgee Branch |
| OSU Stillwater | 405-744-5380 | Employment Verifications |
| OSU Stillwater | 800-233-5019 | Freshman Admissions |
| OSU Stillwater | 800-522-4002 | Correspondence Study ONLY |
| OSU Stillwater Switchboard | 405-744-5000 | Main Number |
| OSU Tulsa | 800-364-0770 | Academic Affairs Office |
| OSU Tulsa | 918-594-8000 | Main Number |
| OSU-OKC | 800-560-4099 | OSU-OKC Campus |
| OSU-OKC Switchboard | 947-4421 | Switchboard |
