|Elevation||61 m (200 ft)|
|• Official||Bhojpuri, Hindi|
|Time zone||IST (UTC+5:30)|
Dumraon is one of Bihar's oldest municipalities and one of India's oldest princely states. It is located 1.5 km south of National Highway (NH) 84 (Ara-Buxar Highway), 20 kilometres (12 mi) north from NH-30 (Patna-Ara-Mohania) and 80 kilometres (50 mi) from NH-2 (Delhi- Kolkata). It is known for its Sinhora. Sights include Bihariji Ka Mandir, Dumrejani mai ka Mandir and Kaliji Ka Mandir. The famous villages near by Dumraon are Kopawan,Nandan,Simari,Ariaon,Sowan.
Horilshah founded this town, and so it was earlier known as Horilnagar. Horilshah was a descendant of "Raja Bhoj Of Dhar" and came from Ujjain. As a princely state its boundaries were the rivers Ganges & Son and included part of Uttar Pradesh.
It is known for the case of the heir of Maharani Beni Kuwari. In early 1900s the case was fought in the Privy council. Mahrani Beni Kuawari was the widow of the then Maharaja of Dumraon. She built the famous Banke Bihariji ka mandir in Raj garh. Apparently she adopted a child from Jagadishpur Riyasat but died mysteriously within 24 hours of the adoption. According to British law, the Riyasat was the new ruler, but Sir Keshav Prasad Singh, a member of the Maharaja's family alleged that the adoption was false and claimed the throne for himself. The adoption was never verified as the main witness went missing and the other contenders either failed to appear or gave statements in favour of Singh. The Court appointed him Steward of Throne. His last grandson, Maharaja Kamal Singh, was a two-time Member of Parliament from Buxar.
In 1947 after independence the "Privy purse" issued to the Maharaja and Dumraon became part of India.
Dumraon is located at  at an average elevation of 61 metres (200 feet)..
As of 2001[update] India census, Dumraon had a population of 45,796. Males constitute 53% of the population. Dumraon has an average literacy rate of 54%, lower than the national average of 59.5%: male literacy is 64% and, female literacy is 43%. In Dumraon, 17% of the population is under 6 years of age.
Colleges include VKS College of Agriculture (BAU, Sabour, Bhagalpur), D.K. college, S.M. Women's college, Inter college and C.P.S.S. Inter College.
Government High schools include Raj High School, C.P.S.S High School, M.C. High School, Maharani usha rani High School, G.H. Urdu High School and Madarsa Fakariya Samsulolum. Some good private schools are St johns secondary school,Rose public school,Bihar Public School, Rising Sun International School, Cambridge, DAV Public School.
The town is served by Dumraon Raj Hospital, Dr. Raghuveer Singh Chikitsalaya and Block (Gov.) Hospital,Sub divisional Hospital.
∗Ustad Bismillah Khan, the shehnai maestro ∗Specialist of homoeopathy,Dr. Taiyab khan ∗Prof Rana Pratap Sinha, Retd Professor & University Head of Psychology, Magadh University, VKS University - also a famous and notable dramatist and playwright of Bihar is a scion of the then Muntazim Estate of Dumraon, a family next to the Dumraon Royal family. ∗Sri Anil Kumar Sinha, IPS - New CBI Director of India (Son of Prof Rana Pratap Sinha)
- Falling Rain Genomics, Inc - Dumraon
- "Census of India 2001: Data from the 2001 Census, including cities, villages and towns (Provisional)". Census Commission of India. Archived from the original on 2004-06-16. Retrieved 2008-11-01.
- Train list