From Pengorffwysfa, Gwynedd to all cities in Hertfordshire starting with letter D
- Damask Green, Gwynedd
- Dancers Hill, Gwynedd
- Dane End, Gwynedd
- Danesbury, Gwynedd
- Darleyhall, Gwynedd
- Dassels, Gwynedd
- Datchworth, Gwynedd
- Datchworth Green, Gwynedd
- Daws End, Gwynedd
- Deacons Hill, Gwynedd
- Digswell, Gwynedd
- Digswell Park, Gwynedd
- Digswell Water, Gwynedd
- Drivers End, Gwynedd
- Dudswell, Gwynedd