Workers at Doncaster council in South Yorkshire and Tower Hamlets council in London are to ballot for strikes over cuts.
The workers’ Unison union has authorised the ballots after members voted to push ahead.
In Tower Hamlets workers backed strikes by five to one in an indicative ballot, and in Doncaster shop stewards voted unanimously for a ballot.
Doncaster council employs more than 14,000 workers, while Tower Hamlets council employs more than 10,000.
This year alone some 800 jobs are under threat in Doncaster and 500 in Tower Hamlets.
In Tower Hamlets the union plans to coordinate with the NUT teachers’ union, which has around 2,000 members in the borough. NUT ballot papers went out last week.
The Unison ballots are expected to begin in the next few weeks.
Some 150 Unison members at Barnet council are voting on strikes over privatisation. The ballot closes on Thursday of this week.