Voters in the rest of the assembly segments can exercise their franchise till 5 pm.
The other seats where polling is being held in this final phase are Rajmahal, Pakur, Nalla, Jamtara, Dumka (ST), Jama (ST), Jarmundi, Sarath, Poreyahat, Godda and Mahagama.
All constituencies are spread over six districts in the Santhal Pargana region of the state.
In all, 40,05,287 electorate, including 19,55,336 women and 30 third gender voters, are eligible to cast their vote, Jharkhand Chief Electoral Officer Vinay Kumar Choubey said.
Adequate security forces have been deployed, he said.
Of 5,389 polling stations, 396 in Naxal-affected areas have been marked as "critical" while 208 have been declared "sensitive".
In all, 1,321 polling stations in non-left wing extremism affected areas have been marked as "critical" while 1,765 declared "sensitive".
The Election Commission has set up 8,987 ballot units, 6,738 control units and 7,006 VVPAT machines.
Altogether, 249 polling stations have been marked as model booths.
As many as 133 polling stations have women staff while 1,347 have webcasting facilities, Choubey said.
BJP candidate and Jharkhand Agriculture Minister Randhir Singh is seeking re-election from Sarath.
State Women and Child Development Minister Louis Marandi is contesting against JMM's working president and former chief minister Hemant Soren from Dumka.
Louis Marandi had defeated Soren in the 2014 assembly elections.
Like the previous assembly polls when he contested from two seats, Soren is in the fray from Barhait as well.
Soren's sister-in-law Sita Soren is seeking re-election from Jama.
The BJP, which is contesting on all 16 seats in this final phase, has fielded sitting MLAs Ashok Kumar Bhagat, Anant Ojha and Amit Mandal from Mahagama, Rajmahal and Godda assembly constituencies, respectively.
Former deputy chief minister and sitting JMM MLA Stephen Marandi is seeking re-election from Maheshpur.
The state president of the Janata Dal (United) and former MP, Salkhan Murmu, is contesting from Sikaripara.
The JMM-Congress-RJD alliance has fielded candidates from all 16 constituencies.
While the JMM has fielded nominees in 11 constituencies, the Congress and the RJD are contesting from four and one segments, respectively.
The Babulal Marandi-headed Jharkhand Vikas Morcha (Prajatantrik) has also fielded candidates in this round.
Candidates of the Bahujan Samaj Party, Lok Jan Shakti Party, AJSU Party and the Left are also in the fray.
Of the 81 assembly seats, elections had concluded in 65 constituencies in the previous four phases between November 30 and December 16.
Votes will be counted on December 23.
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