| Damghan County | |
| Native Name: | Persian: شهرستان دامغان |
| Settlement Type: | County |
| Image Map1: | IranSemnan-SVG.svg |
| Map Caption1: | Location of Semnan province in Iran |
| Subdivision Type: | Country |
| Subdivision Name: | Iran |
| Subdivision Type1: | Province |
| Subdivision Name1: | Semnan |
| Seat Type: | Capital |
| Seat: | Damghan |
| Parts Type: | Districts |
| Parts Style: | para |
| P1: | Central |
| P2: | Amirabad |
| Population As Of: | 2016 |
| Population Total: | 94190 |
| Coordinates: | 35.385°N 54.4031°W |
| Coordinates Footnotes: | [1] |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
Damghan County (Persian: شهرستان دامغان) is in Semnan province, Iran. Its capital is the city of Damghan.[2]
The area suffered damage in the 856 Damghan earthquake.
After the 2011 National Census, the village of Kalateh was elevated to the status of the city of Kalateh Rudbar.[3]
At the time of the 2006 census, the county's population was 81,993 in 23,020 households.[4] The following census in 2011 counted 86,908 people in 25,554 households.[5] The 2016 census measured the population of the county as 94,190 in 30,296 households.[6]
Damghan County's population history and administrative structure over three consecutive censuses are shown in the following table.
| Administrative Divisions | 2006 | 2011 | 2016 | |
|---|---|---|---|---|
| Central District | 72,967 | 76,495 | 81,894 | |
| 4,278 | 4,045 | 4,590 | ||
| 4,318 | 3,854 | 5,162 | ||
| 4,536 | 6,052 | 2,778 | ||
| Damghan (city) | 57,331 | 58,770 | 59,106 | |
| Dibaj (city) | 2,504 | 3,774 | 5,647 | |
| Kalateh Rudbar (city) | 4,611 | |||
| Amirabad District | 9,026 | 10,413 | 12,296 | |
| 4,363 | 4,662 | 5,235 | ||
| 1,559 | 1,429 | 1,863 | ||
| 1,563 | 1,920 | 1,637 | ||
| Amiriyeh (city) | 1,541 | 2,402 | 3,561 | |
| Total | 81,993 | 86,908 | 94,190 | |
The Ali Spring (Cheshmeh-ye Ali) is in Damghan County (not be confused with the Cheshmeh-ye Ali in Ray, southern Tehran). Amirabad District forms the major part of the county. The three cities are Damghan, Dibaj and Amiriyeh.
Other important villages in the county are: Mehmandust, Naimabad, Tazareh, Tuyeh, and Darvar, Qusheh, Hasanabad, and Rashm.
Main Tehran-Mashhad railway is 5 km south of Damghan. Damghan is alongside of Tehran-Mashhad Highway.From south there is main road to Isfahan and Yazd, and northward from Ali Spring (Cheshmeh Ali) & Tuyeh Darvar to Sari and through Dibaj to Behshahr & Gorgan.
Damghan city itself has many ancient and historical places. However outside the city also there are some attractions like: