- Y Felinheli - 1 company
- Yardley Hastings - 1 company
- Yarmouth - 2 companies
- Yate - 9 companies
- Yate Rocks - 1 company
- Yateley - 11 companies
- Yaxley - 3 companies
- Yeadon - 2 companies
- Yelverton - 8 companies
- Yeovil - 58 companies
- Yeovil Somerset - 1 company
- York - 219 companies
- Yorkshire - 8 companies
- Ystrad Mynach - 2 companies
- Ystradgynlais - 1 company
