The thirteenth legislative assembly election was held on 13 April 2011 to elect members of the 140 constituencies in Kerala. Election results were released on 13 May 2011. The results proved to be one of the closest elections in Kerala's history, with the UDF beating the LDF by a margin of 4 seats.
Parties and coalitions
There are Three major political coalitions in Kerala. The United Democratic Front (UDF) is the coalition of centrist and centre-left parties led by the Indian National Congress. The Left Democratic Front (LDF) is the coalition of leftwing and far-left parties, led by the Communist Party of India (Marxist) (CPI-M). The right-wing Bharatiya Janata Party (BJP) is also contesting in the state and fielded candidates in 139 constituencies, with one seat to their NDA alliance partner Janata Dal (United). 
The Bahujan Samaj Party (BSP) is contesting in all the 140 seats.
The All India Anna Dravida Munnetra Kazhagam (AIADMK) contests in 6 seats in the state.
Common election symbols are provided only to national parties and registered recognized state parties. Registered unrecognized parties are given free symbols as per availability, based on request.
The official constituency wise list of candidates with their election symbols 
There are 140 constituencies in Kerala, spread over 14 districts, based on the Delimitation commission of 2002. Many constituencies present in the 2006 elections become non-existent and 24 new constituencies came into existence following the delimitation.
Aranmula constituency in Pathanamathitta district is the only seat in the state that has over two lakh voters at 203,411.The constituency that has the second highest number of voters is Sultan Battery in Wayanad district with over 196,078 voters, followed by Kunnathur in Kollam district with over 190,322 voters. Kozhikode South constituency has the fewest voters with 130,254, followed by Ernakulam with 133,398 and Tanur in Malappuram district with 136,183 voters respectively.
Female voters outnumber the male voters in 127 of the 140 assembly seats.The Aranmula constituency has the highest number of female voters in the state, followed by Adoor with 102,336 and Manalur with 102,300 females.
Peerumedu constituency has the most polling booths, with 195 booths.
Thiruvananthapuram district has the largest number of 100 candidates in the fray, the fewest, with 17 candidates, is in Wayanad.
The Supreme Court upheld the Election Commission's order directing the state government to defer its decision to extend a scheme for providing rice at Rs.2 per kg to all ration card holders that was announced on the eve of the assembly elections.
Former UDF M.L.A. Sobhana George who gave nomination to contest as an Independent candidate from Chenganoor later withdrew her candidature. Janakeeya Vikasana Munnai leader M. R. Murali also withdrew his nomination from contesting polls in Shoranur.
The main promises in the UDF manifesto are:-
The main promises in the LDF manifesto are:-
- The Asianet opinion survey released on 9 March 2011 predicts 77 to 87 seats for UDF, 53 to 63 seats for LDF and 0 to 5 seats for BJP.
- The second round survey by Asianet News on 31 March 2011 changes the tally as follows: UDF 80 to 90; LDF 50 to 60: BJP 0 to 2.
- The opinion survey conducted by Institute for Monitoring Economic Growth, predicted on 31 March 2011 that the UDF will get 72–82 seats and the LDF will get 58–68 seats in the elections.
- The opinion poll conducted by Mail Today-India Today-Headlines Today-Aaj Tak-ORG, announced on 1-April-2011 predicts 96 seats to the UDF and only 41 seats to the ruling LDF, with others getting 3 seats.
- The post-poll study by the Centre for Study of Developing Societies (CSDS) done for The Week, Manorama News and CNN-IBN released on 10 May 2011 predicted 69 to 77 seats for LDF and 63 to 71 seats for UDF, giving a slight advantage to LDF for the first time.
- The third and final survey conducted by Centre for Forecasting and Research (C fore) in association with Asianet released on 10 May 2011 has again changed their predictions as follows: UDF 72 to 82; LDF 58 to 68; BJP 0 to 2 
- The Headlines Today-ORG polls, released on 10 May 2011, predicted that the UDF would win 85 to 92 seats and the LDF would win 48 to 55 seats.
- Star News survey predicted that the UDF is expected to win 88 seats while the LDF will win 49 seats.
- The Congress-backed Jai Hind TV channel predicted that the UDF will win 86–96 seats and the LDF would have to settle for 44–54 seats.
- News24 channel in association with 'Today's Chanakya Agency' predicts UDF 84-102; LDF 35-53; BJP 0-6 .
- Exit poll by 'CVB News-C-Voter' gave UDF 83–91, LDF 49–57 and BJP 1–4 seats.
The thirteenth legislative assembly election was held on 13 April 2011. The filing of nominations for the elections ended on 26 March 2011. A total of 1373 contestants filed nominations. The scrutiny of nominations took place on 29 March 2011. According to the latest revised electoral list, there are a total of 22,878,767 voters, with 11,919,652 women and 10,959,115 men. There are 20,758 polling booths in 11,662 polling locations in the state.
A total of 971 candidates contested the elections, after the withdrawal of nominations closed.
The polling to elect members of assembly from the 140 constituencies in Kerala was held successfully on 13 April 2011. 75.12 per cent voter turn out was recorded in the state. The district wise and constituency wise polling percentage is as given below.
The Election resulted in a slender victory for the UDF coalition winning 72 out of the 140 assembly seats while the incumbent LDF garnered the remaining 68 seats. The UDF lead was further extended to 73 through the subsequent by-election in Neyyattinkara constituency in which the incumbent MLA, R. Selvaraj, resigned from LDF to join UDF and got re-elected.
- (SC) - Constituency reserved for Scheduled caste candidates.
- (ST) - Constituency reserved for Scheduled tribe candidates.
Assembly seat sharing post the Bye Election results: