Williamstown, Rhondda Cynon Taf

Williamstown Welsh: Trewiliam
Williamstown Location within Rhondda Cynon Taf
OS grid reference	ST002907
Principal area	Rhondda Cynon Taf
Ceremonial coonty	Mid Glamorgan
Kintra	Wales
Sovereign state	Unitit Kinrick
Post toun	TONYPANDY
Postcode destrict	CF40
Diallin code	01443
Police	Sooth Wales
Fire	Sooth Wales
Ambulance	Welsh
EU Pairlament	Wales
UK Pairlament	Rhondda
Welsh Assemmly	Rhondda
Leet o places UK Wales Rhondda Cynon Taf 51°36′25″N 3°26′31″W / 51.606989°N 3.441819°W / 51.606989; -3.441819Coordinates: 51°36′25″N 3°26′31″W / 51.606989°N 3.441819°W / 51.606989; -3.441819

Williamstown (Welsh: Trewiliam) is a veelage in Rhondda in the coonty burgh o Rhondda Cynon Taf, athin the historic coonty boondaries o Glamorgan, Wales. Williamstown wis foondit in the 1870s, is locatit at the fuit o Mynydd Dinas an is a destrict o neebourin veelage Penygraig.