The law courts in Redhill which serve the whole of east Surrey and Mole Valley will be closing for good on Thursday (March 23).
Residents needing to attend criminal or county court hearings after this date will need to travel to courts in Guildford, Staines or Crawley.
As well as South East Surrey Magistrates' Court, better known as Redhill Magistrates' Court, and Reigate County Court closing, the Citizens Advice desk will also close, having been based at the same site as the courts in Hatchlands Road, Redhill, for 15 years.
Elaine Parr, district manager for Citizens Advice Reigate and Banstead, said: "The closures mean we will no longer be able to help local people attending court. However we'll still be here to help all sides get the best possible outcome.
"People should contact our Adviceline on 03444 111 444 to try and resolve the issues.
"We've always had good working relationships with court personnel, local housing managers and others who can signpost residents to the agencies that can help them.
"Cases are often complex but with everyone working together to try and help residents we will always make progress towards the best outcome. Homelessness is something we must avoid wherever possible."
While its desk at the courts will close, Citizens Advice still has a base in Cromwell Road, Redhill.
The Government announced the decision to close the courts last year, following a consultation.
The plans are part of the Ministry of Justice's programme to save £200 million. According to a ministry report, the courts operate at 49 per cent of their capacity.
The soon-to-be-vacant buildings are identified in Reigate and Banstead Borough Council's Development Management Plan consultation as a potential place to build either homes or a school.