1911 Census of England and Wales, General Report with Appendices, Table 84: " Counties with the Highest and Lowest Proportions of Population living under Various Conditions of Room Accommodation".

One person or less per room. Over one but not over two
persons per room.
More than two persons per room.
County. Proportion
per 1,000 of
population.
County. Proportion
per 1,000 of
population.
County. Proportion
per 1,000 of
population.
Highest.   Highest.   Highest.  
Soke of Peterborough 658 Monmouthshire 478 Northumberland 287
Isle of Wight 618 Glamorganshire 454 Durham 285
Lincolnshire (Holland) 591 Durham 444 London 177
Cardiganshire 588 Staffordshire 434 Denbighshire 104
Bedfordshire 585 Yorks, West Riding 433 Yorks, West Riding 103
Cambridgeshire 584 Derbyshire 431 Cumberland 97
Lowest.   Lowest.   Lowest.  
Durham 255 Isle of Wight 262 Soke of Peterborough 14
Northumberland 275 Cardiganshire 263 Isle of Wight 16
London 351 Soke of Peterborough 286 Lincolnshire (Lindsey) 28
Monmouthshire 412 Anglesey 288 Westmorland 28
Denbighshire 428 Devonshire 292 Bedfordshire 30
Yorks, West Riding 433 Carnarvonshire 300 Dorsetshire 30
    Radnorshire 303 Leicestershire 30
        Sussex West 30