Householder have been handed a final chance to return their electoral registration forms or face a fine of up to £1,000.
More than 50 people have been issued with court summons after failing to fill in the documents, despite repeated warnings.
However, they will not face prosecution provided they return the forms before their day in court.
Deputy council leader Mark Bowen said: "The vote, and the ability to use it, is one of the fundamental liberties in this country.
"It is important to maintain an accurate and up-to-date electoral register to ensure residents have confidence in the elections process, and as an up-to-date source of information on changes in the local population which affects how services are delivered to all our residents."
A total of 49 residents were fined and ordered to pay costs after failing to complete the forms in 2007.