| Name of the Candidate | Party Name | Results |
| SUNIL KUMAR | Rashtriya Janata Dal | Won 81557 |
| SUNIL KUMAR ALIAS PINTU | Bharatiya Janata Party | 66835 |
| NAGINA DEVI | Independent | 3624 |
| ANUP MAHTO | Rashtriya Janshanti Party | 2236 |
| RAKESH KUMAR TUNNA | Independent | 2059 |
| IRSHAD AHMAD | Bahujan Samaj Party | 959 |
| SHAHIN PARWEEN | Independent | 948 |
| CHANDRIKA PRASAD | Independent | 890 |
| EFTEKHAR AFATAB | Nationalist Congress Party | 781 |
| UMESH PASWAN | Independent | 573 |
| RAM KISHORE RAI | Samajwadi Party | 550 |
| UMESH KUMAR SINGH | Sarvajan Kalyan Loktantrik Party | 487 |
| VINOD SAH | Hindusthan Nirman Dal | 466 |
| RAMESH SAH | Garib Janta Dal (Secular) | 390 |
| RAM VINAY SINGH KUSHWAHA | Bahujan Mukti Party | 374 |
| None of the Above | None of the Above | 1629 |
| AC No | Category | Poll Phases | Last Date of Nominations | Date of Polls | Result |
| 28 | GEN | Phase IV | Oct 7th 2015 | Nov 1st 2015 | Nov 8th 2015 |
Sitamarhi assembly constituencies is a part of the Sitamarhi Lok Sabha constituency. The areas of Dumra CD blocks are covered by the Sitamarhi assembly constituency. A total of 2,46,038 eligible electors in the assembly segment of Sitamarhi of whom 1,31,944 are men and 1,14,083 are women.
One of the eight assembly constituencies located in the district of the same name in Bihar, Sitamarhi is currently held by former Bihar tourism minister and BJP leader Sunil Kumar Pintu who won the seat for the fourth time in a row in the last assembly elections by defeating his nearest Lok Janashakti Party (LJP) rival Raghwendra Kumar Singh by an impressive margin of 5221 votes in a direct contest.
In that election, while Sunil Kumar Pintu polled 51664 votes, Raghwendra Kumar Singh received 46443 votes and was distantly followed by Amarnath Gupta of the Mayawati led Bahujan Samaj Party (BSP) who secured 8055 votes. Kumari Rupam of the Congress was relegated to the fourth place with 3870 votes.
Sunil Kumar Pintu, who was a minister in the Nitish Kumar cabinet, had emerged from the Sitamarhi assembly constituency in 2003, 2005 February, 2005 October/November elections. He first hit the portals of the Bihar assembly by winning the seat in 2003 in a byepoll which was necessitated due to the death of then sitting Sitamarhi BJP MLA Harishankar Prasad who was declared elected from the seat in 2000 by the Supreme Court which set aside the election of the RJD MLA Shahid Ali Khan in 2000. In 2000 Shahid Ali Khan had defeated Harishankar Prasad by a razor-thin margin of 35 votes.
In the byepoll to Sitamarhi assembly seat held on November 20 in 2003, Sunil Kumar Pintu, son of Harishankar Prasad , had trounced Shahid Ali Khan by a huge margin of 34343 votes. Harishankar Prasad had also emerged victorious from the seat in 1995 as a BJP candidate by defeating Shahid Ali Khan, then the outgoing Janata Dal MLA.
One of the six assembly segments located in the Samastipur district of Bihar, Sitamarhi is one of the six assembly constituencies that combine to form the parliamentary constituency of Sitamarhi which is currently represented by Ram Kumar Sharma of the Rashtriya Lok Samata Party (RLSP) who won the seat by defeating his nearest rival Sitaram Yadav of the RJD by a margin of 147965 votes in the 2014 Lok Sabha elections which resulted in the formation of Narendra Modi government at the centre. The RLSP, which entered into an alliance with the BJP, contested three parliamentary seats in Bihar in 2014 and won all of them riding on the Modi wave that was sweeping the country at that time.
Other five assembly constituencies in the Sitamarhi Lok Sabha seat are Runnisaidpur, Bathnaha, Parihar, Sursand and Bajpatti.
BJP has nominated its sitting MLA Sunil Kumar alias Pintu in Sitamarhi. Sunil Kumar bagged 51,664 votes in the assembly elections held in November 2010. He defeated Raghvendra Kumar Singh of LJP with a margin of 5,221 votes who won 46,443 votes. Sitamarhi, the assembly segment, is a part of the Sitamarhi Lok Sabha (parliamentary) constituency of the state of Bihar. The three-time consecutive MLA Sunil Kumar is confident of retaining his seat despite a strong opposition from the Grand Alliance of JD(U)-RJD-Congress combine.