| Business | Phone |
| Johnston County Abc 417 S Brightleaf Blvd, Smithfield 27577 | (919) 934-7249 |
| Johnston County Animal Control 1320 N Brightleaf Blvd, Smithfield 27577 | (919) 934-8474 |
| Johnston County Bldg Inspctns 309 E Market St, Smithfield 27577 | (919) 989-5060 |
| Johnston County E911 Comms Office 120 S 3rd St, Smithfield 27577 | (919) 989-5611 |
| Johnston County Elections Brd 212 E Market St # 205, Smithfield 27577 | (919) 989-5095 |
| Johnston County Emergency Comm 120 S 3rd St, Smithfield 27577 | (919) 989-5059 |
| Johnston County Extension Svc 806 North St, Smithfield 27577 | (919) 989-5380 |
| Johnston County Finance Office 207 E Johnston St, Smithfield 27577 | (919) 989-5110 |
| Johnston County Gis 207 E Johnston St, Smithfield 27577 | (919) 989-5153 |
| Johnston County Grounds Bldg 207 E Johnston St, Smithfield 27577 | (919) 989-5177 |
| Johnston County Heritage Center 241 E Market St, Smithfield 27577 | (919) 934-2836 |
| Johnston County Housing Asstnc 107 E Johnston St, Smithfield 27577 | (919) 989-5070 |
| Johnston County Human Resource 204 S 2nd St, Smithfield 27577 | (919) 938-4700 |
| Johnston County Land Use Center 309 E Market St, Smithfield 27577 | (919) 989-5198 |
| Johnston County Landfill 680 County Home Rd, Smithfield 27577 | (919) 938-4750 |
| Johnston County Manager's Office 207 E Johnston St, Smithfield 27577 | (919) 989-5100 |
| Johnston County Planning Dept 309 E Market St, Smithfield 27577 | (919) 989-5150 |
| Johnston County Register-Deeds 207 E Johnston St, Smithfield 27577 | (919) 989-5160 |
| Johnston County Soil & Water 806 North St, Smithfield 27577 | (919) 934-7156 |
| Johnston County Technology Svc 212 E Market St, Smithfield 27577 | (919) 989-5153 |
| Johnston County Veterans Office 212 E Market St # 207, Smithfield 27577 | (919) 989-5067 |
| Johnston County Wastewater Plt E Huntley St, Smithfield 27577 | (919) 938-4730 |
| Johnston County Water Plant 600 Clear Water Dr, Smithfield 27577 | (919) 938-4740 |
| Johnston Livestock Arena County Road 1503, Smithfield 27577 | (919) 934-9569 |
| Respite Care Home 3310 Nc 210 Hwy, Smithfield 27577 | (919) 934-9213 |