Gilfach is a village in Caerphilly county borough, Wales.
It is situated within the CF81 postcode district, which is within the Bargoed post town.
CF81 is the only postcode district within the Bargoed post town.
The Bargoed post town is within the Cardiff postcode area.
Administrative Ward: Gilfach
Administrative District: Caerphilly
Country: Wales
UK Parliament: Caerphilly