Polling began at 6 am amid stringent security arrangements, officials said.
They said the voting will take place at 300 polling stations across the state and would end at 4 pm.
The officials said 365 candidates are in the fray for 96 wards of eight urban local bodies for the third phase comprising a total electorate of 1,93,990 electors.
The officials said massive security arrangements have been put in place for the smooth conduct of the polls.
They said additional poll staff has been deployed at polling stations with large number of electors.
The officials said the overall poll percentage in the first two phases of the municipal polls has been 47.2 per cent.
Municipal elections, covering 79 municipal bodies with an electorate of about 17 lakh, are being held in four phases. The last phase will take place on Tuesday.
A total of 3,372 nominations have been filed for 1145 wards.
The government has declared holiday on the day of poll in the municipal areas going to polls so as to enable the voters to cast their vote.
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