| Abbreviation | Definition |
|---|---|
| OC | Oleander City (nick-name of Galveston, Texas) |
| OC | Orange County |
| OC | Orange County (California) |
| OC | Osawatomie City, Kansas |
| OCB | Ontario Child Benefit |
| OCCB | Office of Community Capacity Building |
| OCCB | Osceola County Conservation Board |
| OCCC | Orange County Convention Center |
| OCCC | Otter Creek Correctional Complex |
| OCCD | Office Of Coalfield Community Development |
| OCCS | Office of Child Care Services |
| OCCS | Ontario Child Care Supplement for Working Families |
| OCE | Office of the City Engineer |
| OCED | Office of Community and Economic Development |
| OCED | Office of Curriculum and Educational Development |
| OCFS | Office of Children and Family Services |
| OCFSA | Office of Child and Family Service Advocacy |
| OCHS | Okanogan County Historical Society |
| OCIF | Ontario Community Infrastructure Fund |
| OCM | Onondaga-Cortland-Madison counties |