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|• Official||Maithili, Hindi|
|Time zone||IST (UTC+5:30)|
As of 2001[update] India census, Dalsinghsarai had a population above 50,000. Males constitute 53% of the population and females 47%. Dalsinghsarai has an average literacy rate of 60%, higher than the national average of 59.5%: male literacy is 69% and, female literacy is 51%. In Dalsinghsarai, 16% of the population is under 6 years of age. The river traversing the city is Balan. Dalsinghsarai, also known as Dalsingsarai misnomerly, is a sub-division of Samastipur district.
Dalsingsarai is well connected by road. This town is situated on National Highway No.-28, which links Barauni (Bihar) to the capital city of Uttar Pradesh, Lucknow, via Gorakhpur.
The soil of Dalsingsarai is rich alluvial and is excellent for rabi crops. The place is known for its cash crops—tobacco, rice (paddy), wheat, chillies, pulses and vegetables. Once this place was famous for production of red and green chillies in North India. Due to the huge production of best quality tobacco here, During the British rule, the Virginia tobacco company established a cigarette factory here,which has closed down post Independence of India,due to some labour problem.Other than that all types of seasonal vegetables are grown here.The green vegetables are supplied to other parts of the state. Dalsingsarai is famous for Green-Saag, bitter-gourd, tobacco, green chilly, bel(fruit). Famous sweets are Raskadam, Kheerkadam,Parwal Mithai, etc.
The richness and fertility of the land of Dalsinghsarai made the area stand in the league of lychee growing area, at par with areas like Muzaffarpur and Dehradun.Mangoes are also grown here.
Dalsinghsarai is a very prominent mandi in the district because of its locational advantage (located along NH-28) and having presence of highly fertile villages in its catchment. The major arrivals in this mandi include Bitter Gourd, Pointed Gourd, Cauliflower, Brinjal, Cucumber, Tomato, Potato, Peas and Okra. Among the fruits, Mango and Litchi are the most prominent. The major villages in the catchment of this mandi include Basadhia,chakhabib,bhatgama, Madhaipur, Mirjapur, Nargaon, Vajitpur and Malpur. Villages located in 20 km radius of this mandi feed it round the year. The Dalsinghsarai APMC mandi located 3 km from the existing mandi can be considered for the collection center.
Dalsinghsarai is one of the center of education in Samatipur district.
- Chatradhari High School
- Rastriya High School
- Girls High School
- St. Joseph's Public School
- Sharda Gyan Niketan School
- Bol baby bol school
- Chandra Montessori School
- R.B. College
- Eminence Education Center Of KSOU
- Professional InfoTech Mahisari (Mahavir Chouk)
- "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.