1911 Census of England and Wales, General Report with Appendices, Table 66: " Population and Proportion per cent. of Population living under various conditions of Room Accommodation".

Average number of occupants per room. Population in Private Families.
Number. Proportion per cent.
½ or less 3,349,229 9.7
Over ½ but less than 1 7,629,070 22.0
1 5,183,449 15.0
Over 1 but not over 1½ 8,026,230 23.2
  "   1½      "      2 5,501,453 15.9
  "   2      "      2½ 1,668,580 4.8
  "   2½      "      3 955,167 2.8
  "   3 but less than 4 262,374 0.8
4 and over 253,351 0.7
Population in tenements of over 9 rooms 1,777,270 5.1
     
  34,606,173 100.0