This is a list of the historic counties of Wales as recorded by the 1891 census, ordered by their area.
| Rank |
County |
Area (acres)
|
| 1 |
Carmarthenshire |
587,816 (2,378 km²)
|
| 2 |
Glamorgan |
516,959 (2,092 km²)
|
| 3 |
Montgomeryshire |
510,111 (2,064 km²)
|
| 4 |
Brecknockshire |
475,224 (1,923 km²)
|
| 5 |
Cardiganshire |
440,630 (1,783 km²)
|
| 6 |
Merionethshire |
427,810 (1,731 km²)
|
| 7 |
Denbighshire |
423,477 (1,713 km²)
|
| 8 |
Pembrokeshire |
395,151 (1,599 km²)
|
| 9 |
Caernarfonshire |
361,097 (1,461 km²)
|
| 10 |
Monmouthshire |
341,688 (1,382 km²)
|
| 11 |
Radnorshire |
301,164 (1,218 km²)
|
| 12 |
Anglesey |
175,836 (711 km²)
|
| 13 |
Flintshire |
164,050 (663 km²)
|
