A Staffordshire council is set to share some staff and services with a Derbyshire council to save money.
Staffordshire Moorlands District Council and High Peak Borough Council, over the county border, have agreed to the unusual alliance.
Emily Thraine, deputy Tory leader at High Peak, said it mainly involved sharing back office services, such as legal and financial departments.
She said the two councils were "natural friends and natural partners".
Meanwhile, Derbyshire County Council has been contracted to maintain both councils' buildings, which it says will save about £1m a year.