CPI
The table below lists Communist Party of India (CPI) candidates, their total votes, vote share and final position in Adoor Lok Sabha Constituency in Kerala.
| Election year | Candidate Name | Votes Received | Vote Share (%) | Position | Status |
|---|---|---|---|---|---|
| 2004 | Chengara Surendran | 332,216 | 48.54 | 1 | Won |
| 1999 | Chengara Surendran | 314,997 | 45.12 | 2 | Lost |
| 1998 | Chengara Surendran | 333,297 | 48.53 | 1 | Won |
| 1996 | P.K.Raghavan | 286,327 | 42.79 | 2 | Lost |
| 1991 | Bhargavi Thankappan (W) | 308,471 | 46.67 | 2 | Lost |
| 1989 | N. Rajan | 322,130 | 46.89 | 2 | Lost |
| 1984 | P. K. Raghavan | 222,491 | 43.98 | 2 | Lost |
| 1980 | P. K. Kodiyan | 170,433 | 53.04 | 1 | Won |
| 1977 | P. K. Kodiyan | 227,939 | 54.04 | 1 | Won |
| 1971 | K. Bhargavi | 202,569 | 65.24 | 1 | Won |
| 1967 | P. C. Adichan | 179,068 | 51.66 | 1 | Won |