| (1) | (2) | (3) | (4) |
|---|---|---|---|
| Existing commission of the peace area | Existing petty sessions area | Respective new petty sessions area | New county |
| Anglesey | First | South Anglesey | Gwynedd |
| Second | North Anglesey | ||
| Brecon | Brecon Borough | Brecon | Powys |
| Brynmawr | Bedwellty | Gwent | |
| Builth | Builth | Powys | |
| Crickhowell | Crickhowell | ||
| Defynock | Defynock | ||
| Hay | Talgarth | ||
| Merthyr and Penkelly | Brecon | ||
| Penderyn | Merthyr Tydfil | Mid Glamorgan | |
| Talgarth | Talgarth | Powys | |
| Ystradgynlais | Ystradgynlais | ||
| Caernarvon | Bangor | Bangor | Gwynedd |
| Caernarvon (Borough) | Caernarvon | ||
| Caernarvon (County) | Gwyrfai | ||
| Conway and Llandudno | Conwy and Llandudno | ||
| Eifionydd | Efionydd | ||
| Nant Conway | Nant Conwy | ||
| Pwllheli | Pwllheli | ||
| Cardiganshire | Aberayron | Aberayron | Dyfed |
| Aberystwyth | Aberystwyth | ||
| Cardigan | Cardigan | ||
| Lampeter | Lampeter | ||
| Llanbadarn | Aberystwyth | ||
| Llandyssul | Llandyssul | ||
| Llanilar | Aberystwyth | ||
| Rhydlewis | Rhydlewis | ||
| Talybont | Aberystwyth | ||
| Tregaron | Tregaron | ||
| Carmarthenshire | Amman Valley | Amman Valley | |
| Carmarthen Borough | Carmarthen | ||
| Carmarthen (County) | Carmarthen | ||
| Llandilo | Llandeilo | ||
| Llandovery | Llandovery | ||
| Llanelly | Llanelli | ||
| Newcastle Emlyn | Newcastle Emlyn | ||
| Pencader | Pencader | ||
| St. Clears | St. Clears | ||
| Whitland | Whitland | ||
| Denbigh | Bromfield | Wrexham Maelor | Clwyd |
| Ceiriog | Berwyn | ||
| Colwyn Bay | Colwyn | ||
| Denbigh | Dyffryn Clwyd | ||
| Isaled | Dyffryn Clwyd | ||
| Isdulas | Colwyn | ||
| Llangollen | Berwyn | ||
| Ruabon | Wrexham Maelor | ||
| Ruthin | Dyffryn Clwyd | ||
| Uwchddulas and Uwchaled | Nant Conwy | Gwynedd | |
| Wrexham | Wrexham Maelor | Clwyd | |
| Flintshire | Flint | Flint | |
| Hawarden | Hawarden | ||
| Holywell and Caerwys | Flint | ||
| Hope | Hawarden | ||
| Maelor | Wrexham Maelor | ||
| Mold | Mold | ||
| Northop | Mold | ||
| Prestatyn | Rhuddlan | ||
| Rhuddlan | Rhuddlan | ||
| Glamorgan | Aberavon | Afan | West Glamorgan |
| Caerphilly Higher | Upper Rhymney Valley | Mid Glamorgan | |
| Caerphilly Lower | Lower Rymney Valley | ||
| Cowbridge | Vale of Glamorgan | South Glamorgan | |
| Dinas Powis | Vale of Glamorgan | ||
| Gower | Swansea | West Glamorgan | |
| Kibbor | Cardiff | South Glamorgan | |
| Miskin Higher | Cynon Valley | Mid Glamorgan | |
| Miskin Lower | Miskin | ||
| Neath Borough | Neath | West Glamorgan | |
| Neath County | Neath | ||
| Newcastle and Ogmore | Newcastle and Ogmore | Mid Glamorgan | |
| Pontardawe | Lliw Valley | West Glamorgan | |
| Swansea | Lliw Valley | ||
| Cardiff County Borough | Cardiff County Borough | Cardiff | South Glamorgan |
| Merthyr Tydfil County Borough | Merthyr Tydfil County Borough | Merthyr Tydfil | Mid Glamorgan |
| Port Talbot Borough | Port Talbot Borough | Afan | West Glamorgan |
| Swansea County Borough | Swansea County Borough | Swansea | |
| Merioneth | Ardudwy-is-Artro | Ardudwy-is-Artro | Gwynedd |
| Ardudwy-uwch-Artro | Ardudwy-uwch-Artro | ||
| Edeyrnion | Berwyn | Clwyd | |
| Estimaner | Estimaner | Gwynedd | |
| Penllyn | Penllyn | ||
| Talybont | Talybont | ||
| Montgomeryshire | Deytheur | Deytheur | Powys |
| Llanfyllin | Llanfyllin | ||
| Llanidloes | Llanidloes | ||
| Lower Montgomery | Montgomery | ||
| Machynlleth | Machynlleth | ||
| Mathrafal | Mathrafal | ||
| Newtown | Newtown | ||
| Welshpool | Welshpool | ||
| Pembroke | Cemaes | Cemaes | Dyfed |
| Dewsland | Dewsland | ||
| Fishguard | Fishguard | ||
| Haverfordwest | Haverfordwest | ||
| Milford Haven | Milford Haven | ||
| Narberth | Narberth | ||
| Pembroke | Pembroke | ||
| Tenby | Tenby | ||
| Radnorshire | Colwyn | Colwyn | Powys |
| Knighton | Knighton | ||
| Llandrindod Wells | Llandrindod Wells | ||
| New Radnor | New Radnor | ||
| Painscastle | Painscastle | ||
| Presteigne | Presteigne | ||
| Rhayader | Rhayader |