The Prince of Wales will visit St Asaph on Monday to offer his support to flood victims and thank members of the emergency services.
The city was submerged on Tuesday when the River Elwy burst its banks following days of persistent rain.
Hundreds of properties were affected and many families have been forced out of their homes as Christmas approaches.
A spokeswoman for Clarence House said: "Following the terrible floods across areas of the United Kingdom in the past few days, The Prince of Wales is keen to thank emergency services and lend his support to some of the residents affected.
"The Prince decided to visit St Asaph because the city has been particularly badly hit by the flooding, with over 180 homes in St Asaph affected."
More top news
Parents in Wales are being hounded by their children to buy junk food they see on TV according to the British Heart Foundation.
A charity's campaign to improve protection for older people from scams has been given the backing of the Advertising Standards Authority.
A top health boss has told ITV News that change is needed to hospital services in north Wales, that could include A&E.