| population | |
| Johnston | 1941 |
| population | |
| Johnston Railway Station |
 | Haverfordwest Airport | ~ 8.52 km |
| Swansea Airport | ~ 66.24 km |
| Cardiff International Airport | ~ 121.10 km |
| Cornwall Airport Newquay | ~ 146.66 km |
 | Waterford Airport | ~ 150.92 km |
| Exeter International Airport | ~ 158.48 km |
| Bristol Airport | ~ 162.82 km |
| Anglesey Airport | ~ 168.42 km |
| RNAS Yeovilton | ~ 183.59 km |
