Jamalpur is one of 243 constituencies of legislative assembly of Bihar. It is part of Munger Lok Sabha constituency along with other assembly constituencies viz. Suryagarha, Munger and Lakhisarai.
Jamalpur comprises CD Blocks Jamalpur & Dharhara; Gram Panchayats Teliyadih, Naki, Bahira, Agrahan, Barhouna, Gobadda, Kouriya, Baijalpur, Muderi, Rataitha & Barui of Kharagpur CD Block.