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Legislative Assembly elections were held in February 2000, to elect the 324 members of the Bihar Legislative Assembly. The Rashtriya Janata Dal won the most seats, but a short-lived government was formed by an alliance that included the Bharatiya Janata Party and the Samata Party. The voter turnout in the 2000 assembly polls was 62.6%.
| | ||||
| Party | Votes | % | Seats | |
| Rashtriya Janata Dal | 10,500,361 | 28.34 | 124 | |
| Bharatiya Janata Party | 5,424,687 | 14.64 | 67 | |
| Samata Party | 3,205,746 | 8.65 | 34 | |
| Indian National Congress | 4,096,467 | 11.06 | 23 | |
| Janata Dal (United) | 2,396,677 | 6.47 | 21 | |
| Jharkhand Mukti Morcha | 1,306,152 | 3.53 | 12 | |
| Communist Party of India (Marxist-Leninist) Liberation | 925,253 | 2.50 | 6 | |
| Bahujan Samaj Party | 701,936 | 1.89 | 5 | |
| Communist Party of India | 1,334,386 | 3.60 | 5 | |
| Communist Party of India (Marxist) | 338,198 | 0.91 | 2 | |
| United Goans Democratic Party | 96,297 | 0.26 | 2 | |
| Kosal Party | 132,835 | 0.36 | 2 | |
| Marxist Co-ordination Committee | 104,450 | 0.28 | 1 | |
| Others | 2,274,134 | 6.14 | 0 | |
| Independent (politician) | 4,211,341 | 11.37 | 20 | |
| Total | 37,048,920 | 100.00 | 324 | |
| Valid votes | 37,048,920 | 98.60 | ||
| Invalid/blank votes | 527,141 | 1.40 | ||
| Total votes | 37,576,061 | 100.00 | ||
| Registered voters/turnout | 60,091,029 | 62.53 | ||
| Source: ECI | ||||
| Constituency | Winner | Runner Up | Margin | |||||||
| # | Name | Candidate | Party | Votes | Candidate | Party | Votes | |||
| 1 | Dhanaha | Rajesh Singh | BSP | 15034 | Arun Kumar Tiwari | Ind | 11287 | 3747 | ||
| 2 | Bagaha (SC) | Purnmasi Ram | RJD | 58668 | Kailash Baitha | Ind | 39191 | 19477 | ||
| 3 | Ramnagar | Chandra Mohan Rai | BJP | 44454 | Mohammad Salauddin | NCP | 25332 | 19122 | ||
| 4 | Shikarpur (SC) | Bhagirathi Devi | BJP | 35377 | Subodh Kumar | NCP | 22069 | 13308 | ||
| 5 | Sikta | Dilip Varma | BJP | 50592 | Motiur Rahman | CPIMLL | 24147 | 26445 | ||
| 6 | Lauriya | Vishwa Mohan Sharma | INC | 41016 | Ran Vijay Shahi | RJD | 25520 | 15496 | ||
| 7 | Chanpatia | Krishna Kumar Mishra | BJP | 22617 | Sharfuddin Sheikh | SJP | 21058 | 1559 | ||
| 8 | Bettiah | Renu Devi | BJP | 44897 | Shamim Akhtar | Ind | 34056 | 10841 | ||
| 9 | Nautan | Baidyanath Prasad Mahto | SAP | 39584 | Amar Yadav | Ind | 15864 | 23720 | ||
| 10 | Raxaul | Ajay Kumar Singh | BJP | 41983 | Sagir Ahmad | INC | 29032 | 12951 | ||
| 11 | Sugauli | Vijay Prasad Gupta | KP | 39499 | Ramashray Singh | CPM | 38993 | 506 | ||
| 12 | Motihari | Rama Devi | RJD | 78657 | Pramod Kumar | BJP | 44090 | 34567 | ||
| 13 | Adapur | Virendra Prasad Kushwaha | IND | 44227 | Shyam Bihari Prasad | RJD | 43960 | 267 | ||
| 14 | Dhaka | Manoj Kumar Singh | RJD | 59948 | Avaneesh Kumar Singh | BJP | 53851 | 6097 | ||
| 15 | Ghorasahan | Laxmi Narayan Yadav | JDU | 39668 | Lal Babu Prasad | RJD | 18637 | 21031 | ||
| 16 | Madhuban | Sitaram Singh | RJD | 64285 | Rajesh Kumar Roshan | SAP | 43476 | 20809 | ||
| 17 | Pipra (SC) | Surendra Kumar Chandra | RJD | 34469 | Krishnanandan Paswan | Ind | 23702 | 10767 | ||
| 18 | Kesaria | Obaidullah | SAP | 46743 | Yamuna Yadav | KP | 17424 | 29319 | ||
| 19 | Harsidhi | Maheshwar Singh | SAP | 60363 | Awadhesh Kushwaha | RJD | 47645 | 12718 | ||
| 20 | Govindganj | Rajan Tiwari | IND | 31702 | Bhupendra Nath Dubey | SAP | 28439 | 3263 | ||
| 21 | Kateya | Kiran Devi | RJD | 50704 | Mandev Tiwari | BJP | 33548 | 17156 | ||
| 22 | Bhore (SC) | Acharya Vishwanath Baitha | BJP | 59230 | Alagu Ram | RJD | 26857 | 32373 | ||
| 23 | Mirganj | Prabhu Dayal Singh | SAP | 49084 | Abdul Samad | Ind | 24596 | 24488 | ||
| 24 | Gopalganj | Sadhu Yadav | RJD | 30248 | Subhash Singh | BPP | 19372 | 10876 | ||
| 25 | Barauli | Rampravesh Rai | BJP | 52085 | Md. Nematullah | RJD | 42360 | 9725 | ||
| 26 | Baikunthpur | Manjeet Kumar Singh | SAP | 60891 | Lal Babu Yadav | RJD | 40963 | 19928 | ||
| 27 | Basantpur | Satyadeo Prasad Singh | BJP | 67052 | Manik Chand Rai | RJD | 65992 | 1060 | ||
| 28 | Goriakothi | Indra Deo Prasad | RJD | 42324 | Ajit Kumar Singh | Ind | 22198 | 20126 | ||
| 29 | Siwan | Awadh Bihari Choudhary | RJD | 107933 | Wasi Ahmad | BJP | 18696 | 89237 | ||
| 30 | Mairwa (SC) | Satyadeo Ram | CPIMLL | 32996 | Gorakh Ram | INC | 26487 | 6509 | ||
| 31 | Darauli | Sheo Shanker Yadav | RJD | 46047 | Amar Nath Yadav | CPIMLL | 33990 | 12057 | ||
| 32 | Ziradei | Azazul Haque | RJD | 75920 | Shyam Bahadur Singh | SAP | 31000 | 44920 | ||
| 33 | Maharajganj | Umashanker Singh | SAP | 58671 | Damodar Singh | Ind | 22715 | 35956 | ||
| 34 | Raghunathpur | Vijay Shanker Dubey | INC | 34503 | Vikram Kunwar | RJD | 32064 | 2439 | ||
| 35 | Manjhi | Ravindra Nath Mishra | IND | 33725 | Gautam Singh | SAP | 27583 | 6142 | ||
| 36 | Baniapur | Manoranjan Singh | IND | 37926 | Ram Bahadur Rai | RJD | 35837 | 2089 | ||
| 37 | Masrakh | Tarkeshwar Singh | RJD | 47301 | Kedar Nath Singh | SAP | 36842 | 10459 | ||
| 38 | Taraiya | Ram Das Rai | RJD | 40680 | Janak Singh | BJP | 40415 | 265 | ||
| 39 | Marhaura | Yaduvanshi Rai | RJD | 68463 | Surendra Sharma | SAP | 45573 | 22890 | ||
| 40 | Jalalpur | Janardan Singh Sigriwal | BJP | 27408 | Ramjan Ali | SJP | 25800 | 1608 | ||
| 41 | Chapra | Udit Rai | RJD | 76749 | Rambabu Ray | BJP | 54030 | 22719 | ||
| 42 | Garkha (SC) | Muneshwar Choudhary | RJD | 52530 | Amrit Chaudhary | SAP | 45114 | 7416 | ||
| 43 | Parsa | Chandrika Rai | RJD | 74581 | Ram Nath Bidhyarthi | INC | 29071 | 45510 | ||
| 44 | Sonpur | Vinay Kumar Singh | BJP | 72502 | Ramanuj Prasad Yadav | RJD | 70212 | 2290 | ||
| 45 | Hajipur | Nityanand Rai | BJP | 95598 | Rajendra Rai | RJD | 42762 | 52836 | ||
| 46 | Raghopur | Lalu Prasad Yadav | RJD | 70134 | Vishnudev Rai | JDU | 41006 | 29128 | ||
| 47 | Mahnar | Rama Kishore Singh | JDU | 84893 | Munshilal Rai | RJD | 44344 | 40549 | ||
| 48 | Jandaha | Upendra Kushwaha | SAP | 46042 | Achyutanand Singh | Ind | 40681 | 5361 | ||