Results by alliance or party

More information Alliance/Party, Popular vote ...

Alliance/Party				Popular vote			Seats
				Votes	%	±pp	Contested	Won	+/−
	LDF		CPI(M)	4,754,567	31.52%	3.62%	13	12	3
			CPI	1,190,526	7.89%	0.29%	4	3	3
			KC(J)	353,905	2.35%	0.05%	1	1
			JD(S)	340,111	2.25%	0.05%	1	1	1
			LDF Ind.	323,042	2.14%	New	1	1	1
		Total		6,962,151	46.15%	2.45%	20	18	9
	UDF		INC	4,846,637	32.13%	7.27%	17	0	8
			IUML	733,228	4.86%	0.44%	2	1	1
			KC(M)	209,880	1.39%	0.91%	1	0	1
		Total		5,789,745	38.38%	8.52%	20	1	10
	NDA		BJP	1,566,569	10.38%	3.78%	19	0
			IFDP	380,847	1.70%	New	1	1	New
		Total		1,947,416	12.08%	4.18%	20	1	1
Others				387,116	3.39%
Total				15,086,428	100%			20

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By alliance

More information Coalition/Alliance, Parties contesting in Kerala from the Alliance in 1999 ...

Coalition/Alliance	Parties contesting in Kerala from the Alliance in 1999	Seats won in 1999 Election	Parties contesting in Kerala from the Alliance in 2004	Seats won in 2004 Election	Swing
Left Democratic Front	Communist Party of India(12) Communist Party of India (Marxist) (4) Janata Dal (Secular) (1) Kerala Congress (J) (1) Independent (2)	9	Communist Party of India (3) Communist Party of India (Marxist) (12) Janata Dal (Secular) (1) Kerala Congress (J) (1) Independent (1)	18	9
United Democratic Front	Indian National Congress(17) Indian Union Muslim League (2) Kerala Congress (1)	11	Indian National Congress Indian Union Muslim League (1) Kerala Congress	1	10
National Democratic Alliance	Bharatiya Janata Party Janata Dal (United)	0	Kerala Congress (1) P.C. Thomas's Indian Federal Democratic Party 1)	1	1

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• Note:
  1. UPA was not in existence in 1999, instead the number of seats won in 1999 represents the seats won by Indian National Congress
  2. UDF, is a coalition in Kerala, that was formed in 2001, that includes the Indian National Congress, and splinter Congress groups in Kerala.
  3. Left front, was not part of the UPA, in 2004, instead gave outside support.
  4. P. C. Thomas's Indian Federal Democratic Party, later merged with Kerala Congress and the United Democratic Front.

By Party

More information Party, Alliance ...

Party	Alliance	Seats Contested	Seats	Change	Votes	%	±pp
Indian National Congress	UDF	17	1	7	4,846,637	32.13	7.27
Communist Party of India (Marxist)	Left Democratic Front	13	12	8	4,754,567	31.52	3.62
Communist Party of India	Left Democratic Front	4	3	3	1,190,526	7.89	0.29
Bharatiya Janata Party	NDA	19	0		15,66,569	10.38	3.78
Indian Union Muslim League	UDF	2	1	1	733,228	4.86	0.44
Kerala Congress (J)	Left Democratic Front	1	1	1	353,905	2.35	new
Janata Dal (Secular)	Left Democratic Front	1	1	1	340,111	2.25	0.05
Indian Federal Democratic Party	NDA	1	1	new	256,411	1.7	new
Kerala Congress (Mani)	UDF	1	0	1	209,880	1.39	0.91
Bahujan Samaj Party	none	14	0		74,656	0.49	0.48
Peoples Democratic Party (India)	none	1	0	new	45,720	0.3	new
Janata Dal (United)	NDA	4	0		7,806	0.05	1.25
Communist Party of India (Marxist–Leninist) Liberation	None	1	0	new	3,270	0.02	new
Social Action Party	none	1	0	new	2,987	0.02	new
All Kerala M.G.R. Dravida Munnetra Party	none	1	0	new	2,158	0.01	new
Independent	Left Democratic Front	1	1	3	323042	2.14
Total		177	20	–	15,086,428	–

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By constituency

2005 By-election

Due to the death of the sitting MP P. K. Vasudevan Nair, Trivandrum constituency went to bypolls. Turnout for the election was 68.15%^[5]