Hasanpur is an assembly constituency in Rosera Subdivision of Samastipur district in the Indian state of Bihar.

Hasanpur Assembly constituency is composed of the following: Hasanpur and Bithan community development blocks; Kundal I, Kundal II, Shalepur, Jahangirpur and Bishnupur Diha gram panchayats of Singhia CD Block.

[1] Hasanpur Assembly constituency is part of No.

25 Khagaria (Lok Sabha constituency).

[1] Hasanpur Road Junction Railway Station is the busiest station in Samastipur-Khagaria Line.