| population | |
| Mahdishahr | 47475 |
| Shahrestan-e Aradan | 13884 |
| Shahrestan-e Damghan | 94190 |
| population | |
| Shahrestan-e Garmsar | 77421 |
| Shahrestan-e Mayamey | 38718 |
| Shahrestan-e Semnan | 196521 |
| population | |
| Shahrestan-e Shahrud | 218628 |
| Sorkheh | 15523 |
 | Shahrud International Airport | ~ 103.32 km |
| Semnan Municipal Airport | ~ 136.53 km |
| Gorgan Airport | ~ 165.67 km |
| Sari Dasht-e Naz International Airport | ~ 206.62 km |
| Kalaleh Airport | ~ 213.28 km |
| Sabzevar National Airport | ~ 245.45 km |
| Tabas Airport | ~ 267.44 km |
| Bishe Kola Air Base | ~ 270.60 km |
| Bojnord Airport | ~ 302.77 km |
