Arwid Hall and James Allanson will join the two boards respectively
Douglas Council and Jurby Commissioners will not be holding by-elections as only one person in each area has come forward.
In the capital, where a single seat was vacant, Arwid Hall will become the new representative in Central Ward, joining Mark Wheeler and Natalie Byron-Teare.
Meanwhile, James Allanson has joined the board in Jurby, but one seat there still remains unfilled.
He joins Darren Hope, Yasmin Cowell and Phillip Corkill who were elected in April.
EasyJet agrees to £5.7 billion US takeover bid
One in eight drinking above recommended weekly alcohol limit
Renal patients 'near breaking point' over lack of dialysis facilities in the north
Public Health to expand 'stop nicotine' services and accept referrals from children