In the 140-member assembly, LDF won 91 seats, UDF 47, BJP and Independents, one each.
Prime Minister Narendra Modi called up Marxist Veteran V S Achutanandan and congratulated him for the LDF's resounding victory.
Immediately after the poll results were out, Chief Minister Oommen Chandy, who will be submitting his resignation tomorrow, said the poll outcome was a "setback" and they had not expected such a defeat.
Elated over the victory, 92-year-old Achutanandan, who spearheaded the LDF campaign, said it was an LDF wave and the victory was a reflection on the anger of the people on the "corrupt and anti-people policies of the UDF government".
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He also alleged that BJP was able to open its account due to Congress help.
In the Left Democratic Front (LDF) camp, CPI(M) won 58 seats, CPI 19, Kerala Congress(B), CMP, RSP (L) and Congress (S) one each, JDS 3, NCP 2 and party backed independents 5.
Of the 47 seats won by the United Democratic Front (UDF), Congress won 22 seats, Indian Union Muslim League (IUML) 18, Kerala Congress (Mani) 6, Kerala Congress (Jacob) one.
Significantly, P C George, a former Kerala Congress (M) rebel leader, who contested independently from Poonjar, won by 27,821 votes, surprising even his worst critics.
UDF partners-- RSP and JDU, which contested 5 and 7 seats respectively were routed in the polls.
Though BJP managed to win a seat, its key ally BDJS
(Bharat Dharma Jana Sena), a party floated by the Sree Narayana Dharma Paripalana Yogam (SNDP), an organisation of the backward Ezhava community, failed to win a single seat of the 37 seats it contested.
However, party candidates came second in seven constituencies.
Cricketer Sreesanth, who also contested in the BJP ticket from Thiruvananthapuram, bit the dust at the hustings.
Achutanandan, the face of the LDF campaign and Pinarayi Vijayan, Thomas Issac, E P Jayarajan and actor Mukesh are among the prominent winners in the LDF.
While Chandy, former Finance Minister K M Mani, who had to resign in the backdrop of bar bribery allegations, were among those who survived the LDF onslaught, four of his cabinet colleagues, K Babu, who also was under the cloud of bar scam, Shibu Baby John (RSP), K P Mohanan (JDU), P K Jayalakshmi (Congress) fell by the wayside.
UDF managed to win 12 seats in Malappuram, the stronghold of IUML, its key partner and also in Ernakulam, where it won nine seats.
LDF made massive inroads in Thrissur, Kannur, Kozhikode, Kollam, Alapuzha and Thiruvananthapuram districts by capturing maximum seats.
In Thrissur, out of 13 constituencies, all except one went to LDF. In Kollam all 10 seats were won by LDF.
Minor clashes erupted between CPI(M), BJP and IUML workers in various parts of Kannur and Kasaragod districts in North Kerala soon after the LDF victory and one person was killed when a country bomb was hurled at a LDF victory rally in Pinarayi in Kannur.