| Acronym | Definition |
|---|
| PTCO➣Parent Teacher Counselor Organization (Indiana School for the Deaf; Indianapolis, IN) |
| PTCO➣Parent Teacher Community Organization |
| PTCO➣Pemberton Tramway Company Pty Ltd (Australia) |
| PTCO➣Pokemon Trading Cards Online |
| PTCO➣Parent-Teacher-Child Organization |
| PTCO➣Patent, Trademark and Copyright Office (various locations) |
| PTCO➣Port Townsend Community Orchestra (Port Townsend, WA) |