1911 Census of England and Wales, General Report with Appendices, Table 82: " Counties with the Highest and Lowest Proportions of Tenements of Certain Sizes".

Tenements of less than 4 rooms. Tenements with 4 to 6 rooms. Tenements of over 6 rooms.
County. Per 1,000
tenements.
County. Per 1,000
tenements.
County. Per 1,000
tenements.
Highest.   Highest.   Highest.  
Northumberland 559 Derbyshire 788 Radnorshire 314
London 541 Lancashire 773 Westmorland 309
Durham 506 Nottinghamshire 754 Cardiganshire 288
Yorks, West Riding 300 Bedfordshire 745 Yorks, East Riding 278
Shropshire 286 Soke of Peterborough 738 Devonshire 267
Denbighshire 267 Leicestershire 729 Anglesey 260
Cumberland 265 Buckinghamshire 716 Carmarthenshire 256
Anglesey 264 Hertfordshire 712 Carnarvonshire 255
Lowest.   Lowest.   Lowest.  
Soke of Peterborough 74 London 324 Durham 64
Bedfordshire 80 Northumberland 338 Yorks, West Riding 100
Isle of Wight 80 Durham 430 Northumberland 103
Leicestershire 95 Cardiganshire 463 Lancashire 114
Derbyshire 95 Radnorshire 475 Derbyshire 117
Nottinghamshire 97 Anglesey 476 Staffordshire 127