| Code | District | Status | County | Area 1974 | Population estimate 1974 | Population estimate 1992 | Headquarters | Successor UA |
| GD4 | Aberconwy | Borough | Gwynedd | | 49,730 | 54,100 | Llandudno | Conwy |
| C4 | Alyn and Deeside | District | Clwyd | | 68,280 | 74,500 | Hawarden | Flintshire |
| GD1 | Anglesey - Ynys Môn | Borough | Gwynedd | | 62,020 | 69,300 | Llangefni | Isle of Anglesey |
| GD3 | Arfon | Borough | Gwynedd | | 53,640 | 56,100 | Bangor | Gwynedd |
| GT3 | Blaenau Gwent | Borough | Gwent | | 84,080 | 76,900 | Ebbw Vale | Blaenau Gwent, Monmouthshire |
| P3 | Brecknock | Borough | Powys | | 37,120 | 41,500 | Brecon | Powys |
| SG1 | Cardiff | City | South Glamorgan | | 285,760 | 295,600 | Cardiff | Cardiff |
| D4 | Carmarthen | District | Dyfed | | 49,910 | 56,200 | Carmarthen | Carmarthenshire |
| D1 | Ceredigion | District | Dyfed | | 55,430 | 67,900 | Aberystwyth | Ceredigion |
| C1 | Colwyn | Borough | Clwyd | | 45,990 | 56,400 | Colwyn Bay | Conwy, Denbighshire |
| MG3 | Cynon Valley | Borough | Mid Glamorgan | | 69,630 | 65,600 | Aberdare | Rhondda Cynon Taf |
| C3 | Delyn | Borough | Clwyd | | 59,440 | 69,700 | Flint | Flintshire |
| D6 | Dinefwr | Borough | Dyfed | | 36,140 | 38,700 | Llandeilo | Carmarthenshire |
| GD2 | Dwyfor | District | Gwynedd | | 25,870 | 27,300 | Pwllheli | Gwynedd |
| C5 | Glyndŵr | District | Clwyd | | 38,450 | 42,000 | Ruthin | Denbighshire, Powys, Wrexham |
| GT2 | Islwyn | Borough | Gwent | | 66,140 | 67,200 | Blackwood | Caerphilly |
| D5 | Llanelli | Borough | Dyfed | | 76,720 | 74,600 | Llanelli | Carmarthenshire |
| WG2 | Lliw Valley | Borough | West Glamorgan | | 57,460 | 64,200 | Penllergaer | Neath Port Talbot, Swansea |
| GD5 | Meirionnydd | District | Gwynedd | | 30,830 | 32,900 | Dolgellau | Gwynedd |
| MG4 | Merthyr Tydfil | Borough | Mid Glamorgan | | 61,490 | 60,100 | Merthyr Tydfil | Merthyr Tydfil |
| GT5 | Monmouth | District Borough from 1988 | Gwent | | 66,090 | 76,700 | Pontypool | Monmouthshire |
| P1 | Montgomery, renamed Montgomeryshire 1986 | District | Powys | | 43,580 | 53,700 | Newtown | Powys |
| WG3 | Neath | Borough | West Glamorgan | | 66,150 | 66,300 | Neath | Neath Port Talbot |
| GT1 | Newport | Borough | Gwent | | 135,910 | 137,200 | Newport | Newport |
| MG1 | Ogwr | Borough | Mid Glamorgan | | 126,570 | 134,200 | Bridgend | Bridgend, Vale of Glamorgan |
| WG4 | Afan, renamed Port Talbot on 1 January 1986 | Borough | West Glamorgan | | 58,580 | 51,100 | Port Talbot | Neath Port Talbot |
| D2 | Preseli, renamed Preseli Pembrokeshire on 1 April 1987 | District | Dyfed | | 61,700 | 71,200 | Haverfordwest | Pembrokeshire |
| P2 | Radnor, renamed Radnorshire on 8 May 1989 | District | Powys | | 18,670 | 24,000 | Llandrindod Wells | Powys |
| MG2 | Rhondda | Borough | Mid Glamorgan | | 87,710 | 79,300 | Pentre | Rhondda Cynon Taf |
| C2 | Rhuddlan | Borough | Clwyd | | 49,920 | 55,000 | Rhyl | Denbighshire |
| MG5 | Rhymney Valley | District | Mid Glamorgan | | 103,800 | 104,000 | Hengoed | Caerphilly |
| D3 | South Pembrokeshire | District | Dyfed | | 37,060 | 42,700 | Pembroke Dock | Pembrokeshire |
| WG1 | Swansea | City | West Glamorgan | | 190,370 | 189,400 | Swansea | Swansea |
| MG6 | Taff-Ely | Borough | Mid Glamorgan | | 86,880 | 99,700 | Pontypridd | Cardiff, Rhondda Cynon Taf |
| GT4 | Torfaen | Borough | Gwent | | 88,870 | 91,300 | Pontypool | Torfaen |
| SG2 | Vale of Glamorgan | Borough | South Glamorgan | | 106,490 | 114,800 | Barry | Vale of Glamorgan |
| C6 | Wrexham Maelor | Borough | Clwyd | | 106,800 | 117,200 | Wrexham | Wrexham |