| 16 | Extant Roller Coasters |
| 37 | Defunct Roller Coasters |
| 11 | Extant Amusement Parks |
| 5 | Defunct Amusement Parks |
| 5.12 | Roller Coasters per million people (RCMP) |
| 1.99 | Roller Coasters per 1000 sq mi |
| Location | Roller Coasters | % | Population | RCMP | Area (sq mi) | Density |
|---|---|---|---|---|---|---|
| Anglesey | - | - | 69800 | - | 262.899403 | - |
| Blaenau Gwent | - | - | 69600 | - | 39.413016 | - |
| Bridgend | 2 | 0.125000 | 144300 | 13.860014 | 101.890847 | 19.628848 |
| Caerphilly | - | - | 180800 | - | 93.632411 | - |
| Cardiff | - | - | 361468 | - | 56.464027 | - |
| Carmarthenshire | - | - | 186500 | - | 916.156440 | - |
| Ceredigion | - | - | 73100 | - | 722.475780 | - |
| Conwy | 1 | 0.062500 | 116900 | 8.554320 | 423.567732 | 2.360897 |
| Denbighshire | 1 | 0.062500 | 95200 | 10.504202 | 331.238280 | 3.018975 |
| Flintshire | - | - | 155200 | - | 163.784402 | - |
| Gwynedd | 5 | 0.312500 | 123700 | 40.420372 | 973.402308 | 5.136622 |
| Merthyr Tydfil | - | - | 63546 | - | 57.636725 | - |
| Monmouthshire | - | - | 93600 | - | 314.070457 | - |
| Neath Port Talbot | - | - | 142100 | - | 159.391371 | - |
| Newport | - | - | 151500 | - | 76.448027 | - |
| Pembrokeshire | 5 | 0.312500 | 124700 | 40.096231 | 620.292304 | 8.060716 |
| Powys | - | - | 132500 | - | 2019.214382 | - |
| Rhondda, Cynon, Taff | - | - | 239100 | - | 154.793731 | - |
| Swansea | - | - | 245500 | - | 145.802970 | - |
| Torfaen | - | - | 92300 | - | 67.381048 | - |
| Vale of Glamorgan | 2 | 0.125000 | 130700 | 15.302219 | 126.856680 | 15.765823 |
| Wrexham | - | - | 135600 | - | 211.040191 | - |