Gelli is a village in Rhondda Cynon Taf, Wales.
It is situated within the CF41 postcode district, which is within the Pentre post town.
CF41 is the only postcode district within the Pentre post town.
The Pentre post town is within the Cardiff postcode area.
Administrative Ward: Ystrad
Administrative District: Rhondda Cynon Taf
Country: Wales
UK Parliament: Rhondda