| Administration (County Managers Office) |
| Agriculture |
| Albert J. Ellis Airport |
| Behavioral Healthcare Services |
| Board of Elections |
| Buildings & Grounds |
| Clerk of the Court |
| Code Enforcement |
| Council on Aging |
| Department of Social Services |
| District Attorney |
| E-911 Communications |
| Economic Development Commission |
| Emergency Medical Services (EMS) |
| Emergency Services |
| Finance Department |
| Garage - Vehicle Facility |
| Governor's One-on-One |
| Health Department - Animal Control |
| Health Department - WIC |
| Keep Onslow Beautiful |
| Landfill/Solid Waste |
| Library (all 5 branches) |
| Management Information Systems (MIS) |
| Mosquito Control/Vector Control |
| Museum |
| Onslow County Jail |
| Onslow County Sheriffs Department |
| Parks & Recreation |
| Personnel |
| Planning |
| Purchasing & Contracting |
| Register of Deeds |
| Soil Conservation |
| Tax Office |
| Tourism |
| Veterans Services |
| Water Department |
| Youth Services |
