KUALA KANGSAR: The 312 early voters here started casting their ballots from 8am.
Two polling centres will be used for the process.
Dewan Tun Salleh at the police housing quarters will be open from 8am to 5pm, while the centre at the Manong police station will be open from 8am to 2pm.
A total of 292 voters are set to cast their ballots at Dewan Tun Salleh and 20 at the Manong police station.
The Kuala Kangsar by-election will see a four-cornered contest between Barisan Nasional, PAS, Amanah and an Independent candidate.
The by-election is being held following the death of Datuk Wan Mohammad Khair-il Anuar Wan Ahmad, in a helicopter crash in Sarawak on May 5.
In the general election in 2013, Wan Mohammad Khair-il Anuar won the seat with a majority of 1,082 votes.
A total of 32,949 voters (including 312 early voters and five absentee voters) are eligible to exercise their right in the by-election.