| Source | Election Commission of India |
| Date | 01 Jun 2021 |
| Code | Party | Won | Vote % | Total Vote |
|---|---|---|---|---|
| ADMK | All India Anna Dravida Munnetra Kazhagam | 0 | 4.14% | 34,623 |
| AINRC | All India N.R. Congress | 10 | 25.85% | 216,249 |
| BJP | Bharatiya Janata Party | 6 | 13.66% | 114,298 |
| BSP | Bahujan Samaj Party | 0 | 0.14% | 1,169 |
| CPI | Communist Party of India | 0 | 0.90% | 7,522 |
| CPI(M) | Communist Party of India (Marxist) | 0 | 0.04% | 321 |
| CPI(ML)(L) | Communist Party of India (Marxist-Leninist) (Liberation) | 0 | 0.02% | 158 |
| DMDK | Desiya Murpokku Dravida Kazhagam | 0 | 0.30% | 2,524 |
| DMK | Dravida Munnetra Kazhagam | 6 | 18.51% | 154,858 |
| INC | Indian National Congress | 2 | 15.71% | 131,393 |
| JD(U) | Janata Dal (United) | 0 | 0.02% | 141 |
| NOTA | None of the Above | 0 | 1.29% | 10,803 |
| IND | Independent | 6 | 12.68% | 106,098 |
| Other | Other | 0 | 6.74% | 56,405 |
| Total | 30 | 100.00% | 836,562 |
| No | Constituency Name | Winner | Runner up | Margin | ||
|---|---|---|---|---|---|---|
| Candidate | Party | Candidate | Party | |||
| 19 | Ariankuppam | R. Baskar @ Datchanamourtty | AINRC | T. Djeamourthy | INC | 6,418 |
| 23 | Bahour | R Senthilkumar | DMK | N Dhanavelou | AINRC | 211 |
| 21 | Embalam | U Lakshmikandhan | AINRC | M Candassamy | INC | 2,240 |
| 8 | Indira Nagar | V. Aroumougame @ Akd | AINRC | M. Kannan | INC | 18,531 |
| 7 | Kadirgamam | K.s.p @ S. Ramesh | AINRC | P. Selvanadane | INC | 12,246 |
| 12 | Kalapet | P.m.l. Kalyanasundaram | BJP | A. Senthil @ Ramesh | IND | 3,508 |
| 10 | Kamaraj Nagar | A. Johnkumar | BJP | M.o.h.f. Shajahan | INC | 7,229 |
| 26 | Karaikal North | P.r.n. Thirumurugan | AINRC | A.v. Subramanian | INC | 135 |
| 27 | Karaikal South | A.m.h. Nazim | DMK | K.a.u.assana Marecar | ADMK | 12,034 |
| 11 | Lawspet | M. Vaithianathan | INC | V. Saminathan | BJP | 5,701 |
| 29 | Mahe | Ramesh Parambath | INC | N. Haridasan Master | IND | 300 |
| 20 | Manavely | Embalam Selvam @ R.selvam | BJP | R. K. R. Anantharaman | INC | 8,132 |
| 4 | Mangalam | Djeacoumar .c | AINRC | Sun. Kumaravel | DMK | 2,751 |
| 1 | Mannadipet | A. Namassivayam | BJP | A. Krishnan @ A.k. Kumar | DMK | 2,750 |
| 18 | Mudaliarpet | L. Sambath | DMK | A. Baskar | ADMK | 4,179 |
| 13 | Muthialpet | J. Prakash Kumar | IND | Vaiyapuri Manikandan | ADMK | 934 |
| 24 | Nedungadu | Chandira Priyanga | AINRC | A. Marimuthu | INC | 2,214 |
| 17 | Nellithope | Richards Johnkumar | BJP | V. Cartigueyane | DMK | 496 |
| 28 | Neravy-t.r.pattinam | M.nagathiyagarajan | DMK | V.m.c.s.manoharen | BJP | 5,511 |
| 22 | Nettapakkam | P Rajavelu | AINRC | V Vizeaveny | INC | 6,638 |
| 16 | Orleampeth | G. Nehru @ Kuppusamy | IND | S. Gopal | DMK | 2,093 |
| 15 | Oupalam | Annibal Kennedy | DMK | A. Anbalagan | ADMK | 4,780 |
| 3 | Oussudu | Ak Sai J Saravanan Kumar | BJP | P. Karthikeyan | INC | 1,880 |
| 6 | Ozhukarai | M. Sivasankar | IND | N.g. Pannir Selvam | AINRC | 819 |
| 14 | Raj Bhavan | K. Lakshminarayanan | AINRC | S.p. Sivakumar | DMK | 3,732 |
| 9 | Thattanchavady | N. Rangasamy | AINRC | K. Sethu @ Sethu Selvam | CPI | 5,456 |
| 2 | Thirubhuvanai | P. Angalane | IND | B. Kobiga | AINRC | 2,359 |
| 25 | Thirunallar | Pr. Siva | IND | S. Rajasekaran | BJP | 1,380 |
| 5 | Villianur | R. Siva | DMK | S.v. Sugumaran | AINRC | 6,950 |
| 30 | Yanam | Gollapalli Srinivas Ashok | IND | N.rangasamy | AINRC | 655 |