Samastipur is one of the thirty-eight districts of Bihar in India. The district headquarters are located at Samastipur. The district occupies an area of 2904 km² and has a population of 27,16,929 (as of 2001 Census).
As per district Gazetteers, Darbhanga, pages 33 to 34 Darbhanga under the Oinwaras (1325-1525 AD), After a temporary period of instability, Darbhanga came under the control of the Oinwaras, also known as the Kameshwara Thakur or Sugauna Dynasty. These Hindu Chiefs were left undisturbed by the Muslim conquerors, who has by now conquered the whole of Mithila and whose exploits are indicated. The Oinwara Dynasty is noted for their encouragement of leaning and fine arts and their court served as the centre of Sanskrit belle’s letters and philosophy. Among the prominent scholars of age were Gadadhara, Sankara, Vachaspati Mishra, Vidyapati, Amartakara and Amiykara. Kameshwara, the founder of dynasty, was resident of village Oini, near Pusa Road, in the District of Darbhanga. When Hazi Ilyas of Bengal divided Torhut into two parts, the Oinwara Raja shifted his Capital to Sugauna near Madhubani. The southern part of the district was under Hazi Ilyas and the northern part under the Oinwaras. The modern subdivision of Samastipur (originally Shamsuddinpur) was founded by Hazi Shamsuddin Ilyas of West Bengal.
Samastipur became a district in 1972 when it was split from Darbhanga district.
Samastipur district comprises the following Sub-Divisions:
Samastipur sub-division comprises eight blocks: Samastipur, Tajpur, Morwa, Khanpur, Sarairanjan, Pusa, Warisnagar, Kalyanpur.
Rosera sub-division comprises 6 blocks: Rosera, Hasanpur, Bithan, Shivaji Nagar, Singhiya, Bibhutipur.
Dalsinghsarai sub-division comprises 3 blocks: Dalsinghsarai, Ujiarpur, Vidyapati Nagar
Patori sub-division comprises 3 blocks: Patori, Mohanpur, Mohiuddin Nagar briyarpur sarif
There are many important noted people from this district in India as well as abroad. Samastipur district has produced several nationally as well as internationally recognized scientists and famous leaders, including freedom fighters and political leaders, who have occupied ministerial posts in the Government of India have been recognized .
-Shri Satya Narayan Sinha, freedom fighter and a prominent member of Indian National Congress, who was accommodated by Pandit Jawaharlal Nehru in his first cabinet.
-Karpuri Thakur, a socialist leader of National stature became Chief Minister of Bihar twice, first in 1967 and then in 1977. He was resident of a village later named in his memory as Karpuri Gram.
-Shilpa Singh representing India at the Miss Universe 2012 pageant to held in December 2012 at Las Vegas, USA.
-Dr. Deodutta Roy is an internationally recognized Indian-born American cancer scholar from the village Umaidpur of the Samastipur district. Dr. Roy received both his Master of Philosophy (1980) and PhD (1984) in Life Sciences from the Jawaharlal University, New Delhi, India and then went to USA in 1985 to do postdoctoral training. He is a Professor and founding Chair of the Department of Environmental and Occupational Health at the Florida International University, Miami, FL, USA. Dr. Roy served as a member to the International Agency for Research on Cancer Working Group in 1999 and 2005 of the World Health Organization in preparing Iarc Monographs On The Evaluation Of Carcinogenic Risks To Humans: Combined Estrogen−Progestogen Contraceptives And Combined Estrogen− Progestogen Menopausal Therapy. Dr. Roy received Cancer Scholar Award (2014) from the American Association of Cancer Research. He has graduated fifteen doctoral students. His graduate students are well placed in Academia, including deans, professor, associate professor and assistant professor in various US universities, Government, including FDA and the Private Sector. He is on the editorial board of seven journals, including PLOS ONE. He has published more than 100 peer reviewed papers, and edited a book published by Springer, and an Encyclopedia published by Elsevier. Some of his articles are most-cited in the field of estrogen carcinogenesis.
-Dr Shahab Ahmad Quazmi, is a notable doctor in eastern Europe, originates from pusa village samastipur currently working as a project coordinator at MSF(doctors without borders) Greece.His ancestral roots comes from village Chakjado.His grand father Mr Akhtar Ahmad was a notable English teacher during British rule in India.He has two brothers namely Mustujab Ahmad and Seemab Ahmad and a sister Mahe Talat.His father name is Mr Athar Ahmad. Dr. Quazmi got excellency during combatting immigrants crisis at Kos Island, Greece.He is currently working on writing his maiden novel.