| Welsh representation in the House of Commons, 1832--1996 | ||||||||||||
| Year | Welsh seats | UK seats | Welsh share of UK seats | Welsh population | UK population | Welsh share of UK population | Welsh electorate | UK electorate | Welsh share of UK electorate | Welsh seat share/population share | Welsh seat share/electorate share | |
| 1832 | 31 | 658 | 0.047 | 905000 | 24028584 | 0.038 | 41763 | 812938 | 0.051 | 1.251 | 0.917 | |
| 1868 | 33 | 658 | 0.050 | 1417000 | 31484661 | 0.045 | 127385 | 2484713 | 0.051 | 1.114 | 0.978 | |
| 1885 | 34 | 670 | 0.051 | 1571780 | 34884848 | 0.045 | 282242 | 5708030 | 0.049 | 1.126 | 1.026 | |
| 1918 | 37 | 707 | 0.052 | 2656474 | 47088859 | 0.056 | 1170974 | 21392322 | 0.055 | 0.928 | 0.956 | |
| 1922 | 37 | 615 | 0.060 | 2656474 | 44021747 | 0.060 | 1235579 | 20874456 | 0.059 | 0.997 | 1.016 | |
| 1945 | 37 | 640 | 0.058 | 2598675 | 50225224 | 0.052 | 1798199 | 33240391 | 0.054 | 1.117 | 1.069 | |
| 1950 | 36 | 625 | 0.058 | 2598675 | 50225224 | 0.052 | 1802356 | 34412255 | 0.052 | 1.113 | 1.100 | |
| 1955 | 36 | 630 | 0.057 | 2598675 | 50225224 | 0.052 | 1801217 | 34852179 | 0.052 | 1.104 | 1.106 | |
| 1974 | 36 | 635 | 0.057 | 2731204 | 55514603 | 0.049 | 1993516 | 39753863 | 0.050 | 1.152 | 1.131 | |
| 1983 | 38 | 650 | 0.058 | 2790500 | 55679919 | 0.050 | 2113855 | 42192999 | 0.050 | 1.167 | 1.167 | |
| 1996 | 40 | 659 | 0.061 | 2930000 | 58784000 | 0.050 | 2225631 | 43848582 | 0.051 | 1.218 | 1.196 |