| Dhamdaha | |
| Settlement Type: | Town |
| Pushpin Map: | Bihar#India |
| Coordinates: | 25.7394°N 87.1508°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Type2: | Region |
| Subdivision Name2: | Mithila |
| Subdivision Type3: | District |
| Subdivision Type4: | Block |
| Subdivision Name1: | Bihar |
| Subdivision Name3: | Purnia |
| Subdivision Name4: | Dhamdaha |
| Elevation M: | 39 |
| Population Total: | 37987 |
| Population As Of: | 2011 |
| Timezone1: | IST |
| Utc Offset: | +5:30 |
| Postal Code Type: | PIN |
| Postal Code: | 854205 |
Dhamdaha is a town and the administrative Block in Purnia District, Bihar, India. It is situated in the Eastern part of Bihar, about 26 kilometres southwest of Purnia. In the year 2011, the village has a total population of 37,987.[1]
Dhamdaha borders Hanumani Chakla to the north, Rupaspur Khagha to the east, Tarauni Milik to the south, and Chandrahi to the west. Bihar State Highway 65 runs east–west through the village. The average elevation is at 39 metres above the sea level.[2]
Dhamdaha has a Humid Subtropical Climate (Cwa). It sees the most amount of rainfall in July, with an average precipitation of 384 mm; and the least amount of rainfall in November, with an average precipitation of 6 mm.
In the year 2011, Dhamdaha has a total of 7,616 households. Out of the 37,987 inhabitants, 19,928 are male and 18,059 are female. The total literacy rate is 48.46%, with 10,957 of the male population and 7,453 of the female population being literate.