Presently, Madhubani Lok Sabha constituency comprises the following six Vidhan Sabha segments after reorganization in 1976
Before 1976, Madhubani assembly segment formed part of eastern Lok Sabha constituency of the district of same name, but after 1976 the eastern eastern Lok Sabha constituency was renamed as Jhanjharpur because Madhubani assembly segment was taken out of it to be merged into former Jainagar Lok Sabha constituency. Jainagar Lok Sabha constituency included western assembly segments of Madhubani district besides Jale assembly segment from Darbhanga district. After inclusion of Madhubani assembly segment, Jainagar Lok Sabha constituency was renamed as Madhubani and Ladania CD block and adjoining areas were taken out of it to be merged into newly formed Jhanjharpur Lok Sabha constituency in order to compensate for the loss of Madhubani assembly segment. After this reorganization, communist vote bank in the district was bifurcated and CPI had to face greater difficulties in winning the eastern Lok Sabha constituency of this district which was won by CPI candidate Bhogendra Jha in 1967 and 1971.
Members of Parliament
Before reorganization in 1976, the following members were elected to Madhubani seat which comprised eastern part of Madhubani district including the district headquarter:
1952: Anirudha Sinha, Indian National Congress
1957: Anirudha Sinha, Indian National Congress
1962: Yogendra Jha, Praja Socialist Party
1967: Shiva Chandra Jha, Samyukta Socialist Party
1971: Jagannath Mishra, Indian National Congress
After reorganization in 1976, the following members were elected to Madhubani seat, which comprised western part of Madhubani district formerly known as Jainagar Lok Sabha constituency (the eastern constituency of the district renamed as Jhanjharpur in 1976):
1977: Chaudhary Hukumdev Narayan Yadav, Janata Party
1980 Jan: Shafiqullah Ansari, Indian National Congress, General election; Mr Shafiqullah Ansari died after four months of general election.
1980 May: Bhogendra Jha, Communist Party of India, bye-election.
1984: Maulana Abdul Hannan Ansari, Indian National Congress
1989: Bhogendra Jha, Communist Party of India
1991: Bhogendra Jha, Communist Party of India
1996: Chaturanan Mishra, Communist Party of India
1998: Shakeel Ahmad, Indian National Congress
1999: Chaudhary Hukumdev Narayan Yadav, Bharatiya Janata Party
2004: Shakeel Ahmad, Indian National Congress
2009: Chaudhary Hukmadeo Narayan Yadav, Bharatiya Janata Party