Supaul district is one of the thirty-eight districts of Bihar state, India, and Supaul town is the administrative headquarters of this district. This district occupies an area of 2,410 km2 (931 sq mi). The district was carved out from the erstwhile Saharsa district on 14 March 1991.

Supaul district occupies an area of 2,425 square kilometres (936 sq mi),comparatively equivalent to Antarctica’s Anvers Island.

Supaul district is bounded by Nepal to the north, Araria district to the east, Madhepura and Saharsa districts to the south and Madhubani district to the west.

Supaul district is a part of Kosi division.

The Koshi River flows through this district, which is regularly affected by the flood caused by this river. It is home district of internationally renowned designer.

Jawahar Navoday Vidyalaya ,Pathra (Supaul) is situated 4 km east of District Headquarter. This school is top in the district in producing brilliant and young minds serving in different parts of India contributing towards the advancement of the nation. Some of the alumni from here are working as IAS ,IPS and many more are doctors,engineers , CA etc. from the reputed institutions.

Agriculture is the major occupation of this district and paddy is the main crop.

In 2006 the Ministry of Panchayati Raj named Supaul as one of the country’s 250 most backward districts (out of a total of 640). It is one of the 36 districts in Bihar currently receiving funds from the Backward Regions Grant Fund Programme (BRGF). From Dec 2012, Bivha International Child Fund is funding for education in Supaul (koshi division),. Several program are funded for education, agriculture from Bivha International School, Bivha Rural Development fund, national banks, NABARD, & World Bank.A dairy farm, which produce approx 1,00,000 liter milk per day, has been also established by Bivha Corporation in simrahi Bazar (Supaul). There is also an egg farm, which produces approx 20,000 eggs per day, It is established by M/S Koshi egg layer farm in parsauni village (Supaul).ref name=”Times of India”.

The well-known historical and religious place, namely, Durga Sthan, lies in Supaul district and it is only 10 km (6 mi) away from the district headquarters.

According to the 2011 census Supaul district has a population of 2,228,397, roughly equal to the nation of Latvia[8] or the US state of New Mexico. This gives it a ranking of 204th in India (out of a total of 640) districts. The district has a population density of 919 inhabitants per square kilometre (2,380/sq mi) . Its population growth rate over the decade 2001-2011 was 28.62%. Supaul has a sex ratio of 925 females for every 1000 males,and a literacy rate of 59.65%