Llanfihangel Din Sylwy is a village in Anglesey, Wales.
It is situated within the LL58 postcode district, which is within the Beaumaris post town.
LL58 is the only postcode district within the Beaumaris post town.
The Beaumaris post town is within the Llandudno postcode area.
Administrative Ward: Pentraeth
Administrative District: Isle of Anglesey
Country: Wales
UK Parliament: Ynys Môn