| Ward | Area type | GSS code |
|---|---|---|
| Y Bontnewydd | Electoral division | W05001567 |
| Y Faenol | Electoral division | W05001568 |
| Y Groeslon | Electoral division | W05001569 |
| Ynys Gybi | Electoral division | W05001505 |
| Ynyscedwyn | Electoral division | W05001175 |
| Ynysddu | Electoral division | W05001677 |
| Ynysybwl | Electoral division | W05001115 |
| Yr Eifl | Electoral division | W05001570 |
| Yscir with Honddu Isaf and Llanddew | Electoral division | W05001176 |
| Ystrad | Electoral division | W05001116 |
| Ystrad Mynach | Electoral division | W05001678 |
| Ystwyth | Electoral division | W05001331 |