Among those who will receive gifts from the King are Susan and Roger Whitehouse from Tywyn, Gwynedd.
The couple said they were “very surprised” to be recognised together, having never sought recognition for their service.
“We’ve simply tried to serve where needed,” they said.
“Our faith informs what we do and why we do it, and it has drawn us deeper into the life of the church while also helping us look outward to the wider community.”
Crowds lined the high street in St Asaph ahead of the royal couple’s arrival, while graffiti saying “Not our King” was also covered up at the cathedral before the visit.
Workers in hi-vis jackets were seen attempting to remove the message which was sprayed using red paint on a wall in the grounds of the cathedral.
A small group of republican protesters with flags and banners calling for the end of the monarchy also gathered across the road from the cathedral as the King and Queen arrived.