Labour came up trumps in the Whaddon by-election.
Camilla Turnbull is now councillor for the Whaddon ward after fellow Labour councillor Nigel Long stood down just days after May's local elections.
The by-election took place last night (Thursday), with Cllr Turnbull - already a parish councillor - getting 1,108 votes.
Her closest contestant, Conservative candidate Donald Mcleod got 914 votes.
Anna Seymour, England First Party candidate, got 221 votes.
Liberal Democrat candidate Alfred Vella got 129 votes, followed closely by UKIP candidate Michael Maylam who got 109 votes.
Independent candidate Samantha Browne got 49 votes.
Following the election Cllr Turnbull - who was a Milton Keynes councillor from 1997 until 2001 - said: "I am absolutely delighted.
"I was a councillor for this ward before and I've carried on being a parish councillor since then, so I know a lot of the constituents.
"They thought I was the best candidate.
"Everyone in the party has worked very hard."
Cllr Long controversially stood down from he position after 20 years of service at the council after getting a full time professional job in the housing arena.
The post is politically restricted under the Local Government Act so he could not legally continue as a Milton Keynes councillor.
He handed over the leadership to Cllr Kevin Wilson.
Liberal Democrat leader Isobel McCall said of Cllr Long's resignation at the time: "Why did he not resign in time for the Whaddo by election to be run at the same time as the local elections?
If he had done, then it would have saved taxpayers money and the council staff time."
Seven ballot papers were rejected due to people voting for more than one candidate or for being uncertain.