Elections in Uttar Pradesh
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Elections in Uttar Pradesh are conducted every five years to elect the State assembly and its share of members to the Lok Sabha. The elections are conducted in accordance with the Constitution of India. The Assembly of Uttar Pradesh creates laws regarding the conduct of local body elections unilaterally while any changes by the state legislature to the conduct of state level elections need to be approved by the Parliament of India. In addition, the state legislature may be dismissed by the Parliament according to Article 356 of the Indian Constitution and President's rule may be imposed. There are 403 assembly constituencies and 80 Lok Sabha constituencies(seats) . The 80 Lok Sabha constituencies of Uttar Pradesh are a deciding factor for who holds power in the 16th Lok Sabha. The state has conducted 16 assembly elections and 15 Lok Sabha elections since independence.
Main Political Parties
INC=Indian National Congress, BJP=Bharatiya Janata Party (erstwhile BJS or JS: Bharatiya Jan Sangh),
JP=Janata Party, JD=Janata Dal, SP=Samajwadi Party (Mulayam Singh Yadav), BSP=Bahujan Samaj Party (Kanshi Ram + Mayawati),
SSP: Samyukta Samajwadi Party (Lohia), PSP: Praja Samajwadi Party, CPI: Communist Party of India
Lok Sabha elections
The Lok Sabha is the directly elected lower house of the Parliament of India. As of 2013 there have been fifteen Lok Sabhas elected by the people of India. Uttar Pradesh has 80 Lok Sabha constituencies.
Lok Sabha constituencies
Lok Sabha Results
1951+52 - 1st general election. Congress - 64 seats out of total 69.
1957 – Congress: Approx 70 out of 75 (Constituencies not numbered properly on the reference page, so exact calculation is difficult) 
1962 – Congress: 62/85, plus a party named JS (Official site shows data for only 66 seats) 
1967 – Total: 85. Congress 48/85, Jan Sangh: 12, CPI, CPM, PSP, SSP other parties.
1971 – Congress: 73/85, BJS: 4
1977 - 6th general election - Janata Party (a.k.a. Bharatiya Lok Dal) + Allies : All 85 / 85 seats. Congress - Zero.
1980 – Cong: 50/85, Janata (Soc of Charan Singh): 29.
1984 - Congress 82 or 83 out of 85 seats
1989 – Janata Dal: 54/85, BJP: 8, Cong: 15
1991 - BJP: 51/85, JD (VP Singh): 22, JP (Chandra Shekhar): 4, Cong: 5
1996 - 11th general election – BJP: 52/85, SP (Mulayam): 16, BSP: 6, Cong: 5
1998 - BJP - 58/85, Congress - Zero, Samajwadi Party (Mulayam Singh Yadav) - 19, BSP (Mayawati) - 4
1999 - BJP: 29/85, SP: 26, BSP: 14, INC: 10
- State of Uttarakhand, with 5 seats, was carved out of UP in 1999/2000. Thus UP's contingent came down to 80 seats.
2004 - SP: 35/80, BSP: 19, BJP: 10, Cong: 9
2009 - SP: 23/80, Cong: 21, BSP: 20, BJP: 10
2014 - 16th general election. BJP+Allies: 73/80 seats, SP: 5, Congress: 2 (Sonia Gandhi + Rahul Gandhi), BSP: Zero
Vidhan Sabha elections
Uttar Pradesh has 403 assembly constituencies. The Chief Minister of the state is elected by legislators of the political party or coalition commanding an assembly majority, and serves a five-year term with a provision of re-election. The Governor is the head of state, but his or her role is largely ceremonial.
Vidhan Sabha Results
1951/52 - Total: 430. Indian National Congress: 388/430, SP: 20, Jan Sangh: 2, Ind: 15. Chief Ministers: Gobind Vallabh Pant, Sampurnanand 
1957 - Total: 430. Congress: 286, PSP: 44, BJS: 17, CPI: 9, Ind: 74 (Chief Ministers: Sampurnanand, Chandra Bhanu Gupta) 
1962 - (CMs: Chandra Bhanu Gupt, Sucheta Kripalani)
1967 - (CMs: Chandra Bhanu Gupt, Sucheta Kripalani) INC: 199/388 seats. Bharatya Jan Sangh: 98, SSP: 44, CPM: 13, Swatantra Party: 12, PSP: 11
1969 - (CMs: C B Gupta, Charan Singh, Tribhuvana Narayana Singh, Kamalapati Tripathi, H N Bahuguna) Total: 425. Congress: 211, Bharatiya Kranti Dal: 98, BJS: 49, SSP: 33
1974 - (CMs: Bahuguna, Narayan Dutt Tiwari) Total: 425. Congress: 215, Bharatiya Kranti Dal: 106, BJS: 61, CPM:16, NCO: 10
1977 - Janata Party: 352 out of 425 Congress: Approx 45-50. (This assembly saw Ram Naresh Yadav and Banarasi Das as CM)
1980 - (CMs: Vishwanath Pratap Singh, Shripati Mishra, N D Tiwari)
1985 - Total: 425. Congress: 269, Lok Dal (Charan Singh): 84, Janata: 20, BJP: 16
1989 - (This assembly saw Mulayam Singh Yadav as CM) Total: 425. JD: 208, INC: 94, BJP: 57
1991 - (This assembly saw Kalyan Singh as CM) Total: 425. BJP: 221, JD (Mulayam, et al.): 92, INC: 46, JP: 34, BSP: 12
1993 - (Chief Ministers: Mulayam Singh + Mayawati; SP+BSP coalition)
1996 - (CMs: Mayawati + Kalyan Singh + Rajnath Singh; BSP+BJP coalition for some period)
2002 - (Chief Minister(s): Mulayam Singh)
2007 - (Chief Minister(s): Mayawati)
2012 - (CM: Akhilesh Yadav.) Total: 403. SP: 224, BSP: 80, BJP: 47, Cong: 28
2017- (CM: Yogi Adityanath ) Total: 403. BJP:325 SP+Cong: 57, BSP: 19
- "Uttar Pradesh General Election Results 2014".
- "Statistical Report on General Election, 1951". Election Commission of India.
- "Statistical Report on General Election, 1957". Election Commission of India.
- "Statistical Report on General Election, 1962". Election Commission of India.
- "Statistical Report on UP Vidhan Sabha Elections, 1951-52" (PDF). Election Commission of India.
- "Statistical Report on UP Vidhan Sabha Elections, 1957" (PDF). Election Commission of India.