Norman Owen, the Liberal Democrat candidate in the Salford mayoral elections, has blamed the coalition government for the loss of his election deposit. Owen also lost his seat on the council to Labour.
Labour's Ian Stewart has become Salford's first elected mayor after a second round of voting.
Voters have chosen the current council leader Joe Anderson as Liverpool's first mayor. He won the election with 54% of the vote.
Voters in Manchester voted against having an elected mayor in a referendum.