The four men, including former leader Bernard Assinder and the mayor Steve Bartlett, have been charged as part of a Gwent police investigation which has so far involved 26 councillors, half of the council's total membership.
Inquiries were continuing in relation to other allegations and files relating to these will be submitted to the Crown Prosecution Service, the police confirmed this week.
The matter is also the subject of a Labour Party investigation.
'In the meantime, the council is continuing to co-operate with the police investigation.'
The four councillors will appear before Newport magistrates on 21 December.