Source PA
Estimated declaration times are based mainly on forecasts obtained from councils. In some cases where councils have not provided a forecast the estimate is based on actual times from previous polls. These estimates can only be taken as a rough guide and are subject to change in the light of new information.
Estimated times for declarations for the regional PR top-up seats are particularly uncertain as the declaration can only be made once all the results from first-past-the-post seats in the region concerned have been declared.
| 24 | Merthyr Tydfil & Rhymney | 01:00 |
| 5 | Blaenau Gwent | 02:00 |
| 36 | Torfaen | 02:00 |
| 3 | Alyn & Deeside | 02:30 |
| 13 | Carmarthen East & Dinefwr | 02:30 |
| 19 | Delyn | 02:30 |
| 23 | Llanelli | 02:30 |
| 37 | Vale of Clwyd | 02:30 |
| 40 | Ynys Mon | 02:30 |
| 1 | Aberavon | 03:00 |
| 2 | Aberconwy | 03:00 |
| 4 | Arfon | 03:00 |
| 6 | Brecon & Radnorshire | 03:00 |
| 16 | Clwyd South | 03:00 |
| 17 | Clwyd West | 03:00 |
| 20 | Dwyfor Meirionnydd | 03:00 |
| 21 | Gower | 03:00 |
| 26 | Montgomeryshire | 03:00 |
| 27 | Neath | 03:00 |
| 34 | Swansea East | 03:00 |
| 35 | Swansea West | 03:00 |
| 39 | Wrexham | 03:00 |
| 8 | Caerphilly | 03:30 |
| 22 | Islwyn | 03:30 |
| 28 | Newport East | 03:30 |
| 29 | Newport West | 03:30 |
| 15 | Ceredigion | 04:00 |
| 25 | Monmouth | 04:00 |
| 7 | Bridgend | 05:00 |
| 9 | Cardiff Central | 05:00 |
| 10 | Cardiff North | 05:00 |
| 11 | Cardiff South & Penarth | 05:00 |
| 12 | Cardiff West | 05:00 |
| 18 | Cynon Valley | 05:00 |
| 30 | Ogmore | 05:00 |
| 31 | Pontypridd | 05:00 |
| 33 | Rhondda | 05:00 |
| 38 | Vale of Glamorgan | 05:00 |
| 101 | South Wales Central | 05:00 |
| 14 | Carmarthen West & Pembrokeshire South | 06:00 |
| 32 | Preseli Pembrokeshire | 06:00 |
| 103 | South Wales West | 06:00 |
| 104 | Wales Mid & West | 06:00 |
| 105 | Wales North | 06:00 |
| 102 | South Wales East | 07:00 |
