| Council | Population | Area, km² | People / km² | Website |
|---|---|---|---|---|
 Anglesey | 70,0432019 | 749.0 | 94 | anglesey.gov.uk |
 Blaenau Gwent | 69,7132018 | 108.7 | 641 | blaenau-gwent.gov.uk |
 Bridgend County Borough | 144,8762018 | 250.7 | 578 | bridgend.gov.uk |
 Caerphilly County Borough | 181,0192018 | 277.4 | 653 | caerphilly.gov.uk |
 Cardiff | 364,2482018 | 140.9 | 2,585 | cardiff.gov.uk |
 Carmarthenshire | 187,5682018 | 2,370.3 | 79 | carmarthenshire.gov.uk |
 Ceredigion | 72,9922018 | 1,785.6 | 41 | ceredigion.gov.uk |
| Conwy County Borough | 117,1812018 | 1,125.8 | 104 | conwy.gov.uk |
 Denbighshire | 95,3302018 | 836.8 | 114 | denbighshire.gov.uk |
 Flintshire | 155,5932018 | 437.5 | 356 | flintshire.gov.uk |
 Gwynedd | 124,5602019 | 2,534.9 | 49 | gwynedd.llyw.cymru |
 Merthyr Tydfil County Borough | 60,1832018 | 111.5 | 540 | merthyr.gov.uk |
 Monmouthshire | 94,1422018 | 849.1 | 111 | monmouthshire.gov.uk |
| Neath Port Talbot | 142,9062018 | 441.3 | 324 | neath-porttalbot.gov.uk |
 Newport | 167,8992024 | 190.5 | 881 | newport.gov.uk |
 Pembrokeshire | 125,8182019 | 1,618.7 | 78 | pembrokeshire.gov.uk |
 Powys | 132,4472018 | 5,180.7 | 26 | powys.gov.uk |
| Rhondda Cynon Taf | 240,1312018 | 424.1 | 566 | rctcbc.gov.uk |
| Swansea | 246,4662018 | 379.7 | 649 | swansea.gov.uk |
| The Vale of Glamorgan | 132,1652018 | 331.1 | 399 | valeofglamorgan.gov.uk |
 Torfaen | 93,0492018 | 125.7 | 740 | torfaen.gov.uk |
 Wrexham County Borough | 136,1262018 | 503.8 | 270 | wrexham.gov.uk |
22 councils · population: latest estimate in Wikidata, year in small type · source: Wikidata