[3] Darreh Shahr County's population history and administrative structure over three consecutive censuses are shown in the following table.

There are about 1,220 km2 (470 sq mi) of woodlands in the county, most of which are on the higher altitudes of the Kabir Kouh range to the south.

It was established in 2001 and has an area of 179 km2 (69 sq mi) between the elevations of 950-2790m on the northern, greener, side of Kabir Kouh.

[9] Rivers Lakes Darreh Shahr County has a warm climate with hot dry summers and mild wet winters.

July–August maximum daily temperature can as high as 48 °C (118 °F) during heat waves, which are frequent in summer due to proximity to the Iraqi desert.

[10] Hail and lightning storms are not uncommon in Fall and Spring and have devastating effects on crops and the farming-dependent economy of the county.

[11] In prehistoric times, a huge landslide occurred in the south eastern parts of Kabir Kuh range.

[14] Darreh Shahr is a large producer of daffodils with about 230 hectares (570 acres) of cultivated farms and an average annual production of 7 million flowers, most of which is marketed in cities of Tehran, Isfahan, Ahvaz and Arak.

[21][22] The majority of the people living in urban areas, especially Darreh Shahr, work in construction and services trades sector.

The factory mainly serves the domestic and local markets with limited exports to Iraq in recent years.

Darreh Shahr county has been a popular settlement area throughout history because of the abundance of nearby natural resources, specifically the proximity of Kabir Kouh range as a source of water, fertile soil, woodlands, and wildlife.

The entrance of the cave is 30 meters long, and there is a small pond built of stone and sarouj (plaster of lime and ash or sand).

[32] Jaber Mausoleum, which resembles the Tomb of Daniel in Susa with a northern entrance, is 15 m long and 9 m wide with 8 pillars.

[33] Baba Seifedin Mausoleum is located in the north east of Darreh Shahr, on the outskirts of a hill known as Chahar Taq.

Tikhan (or Tiqan) is located among the agricultural lands in Jamshid Abad village north east of Darreh Shahr.

Some colored and engraved earthenware objects have been discovered in the basement of the building, the nature of which suggests the area to have once been involved in pottery production.

[36] Bahram-e Choobin Gorge, a narrow and high valley, is one of the most important and strategic points of the region, located in the western side of the Darreh Shahr - Pol Dokhtar road.

Though in disrepair, this and the interior plaster works of the Imamzadeh are unique and counted as worthy vestiges of this period.