According to the final list posted on the website of the Tamil Nadu Chief Electoral Officer, a total of 72 nominations were accepted and out of it 13 nominees withdrew, leaving 59 candidates, including a woman, in the contest.
The seat has fallen vacant due to the death of sitting member and then chief minister Jayalalithaa on December 5 last year.
The first election to be held after the demise of the late AIADMK supremo, the bypoll is seen as a litmus test for the ruling party which is facing a barrage of opposition accusations including alleged corruption.
The key contestants in the bypoll are ruling party's E Madusudanan, an old party warhorse and a former Minister, and DMK's up and coming leader N Marudhu Ganesh.
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Rival AIADMK leader TTV Dhinakaran, touted as a formidable leader and having the following of party cadres by his camp, is fighting the bypoll as an independent.
On the symbol for Dhinakaran, who has sought 'hat', Returning Officer K Velusamy told PTI that "free symbol is being alloted."
Dhinkaran had unsuccessfully moved the Delhi High Court seeking allotment of the 'hat' symbol, which was given to him in the rescinded April 12 bypoll to the constituency as the then candidate of V K Sasikala led faction.
Freezing the AIADMK's "two leaves" symbol after then rebel leader and now deputy chief minister O Panneerselvam staked claim to it, the Election Commission had then alloted free symbols to the two groups.
Counting of votes will be held on 24 December and the result is expected in a matter of few hours on that day.
R K Nagar has an electorate of 2,28,234 comprising 1,10,903 men, 1,17,232 women and 99 transgenders.
Jayalalithaa was elected from the constituency in May 2016 general election to the state assembly. She had earlier also got elected from there in a bypoll.
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