Voters are selecting the last three councillors in a delayed local authority ballot.
The election in Dunoon, Argyll and Bute, was rescheduled by a week after the death of SNP candidate Alister MacAlister.
Polling stations in the town open between 7am and 10pm on Thursday. The electronic count will start at the Queen's Hall about 30 minutes afterwards.
A spokesperson for Argyll and Bute Council said the authority was hoping the result would be known by midnight.
Despite the delayed election, the 12 elected SNP councillors have already formed an administration in coalition with independent members and local group Argyll First.
Deals are being struck around Scotland's 32 councils.
Labour has reached an agreement with the Conservatives to run Aberdeen, giving it the lead role in the three largest cities. Labour won a majority in Glasgow last week and formed a coalition with the SNP in Edinburgh.
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- Negotiations across the Lothians in the wake of local government elections
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