1931 Census of England and Wales, General Report, Table 13 : " Density of Population in Administrative Counties with Associated County Boroughs, England and Wales, 1921 and 1931".

County of Persons per 100 Acres
1921 1931
England and Wales 101 107
 
Bedford 68 73
Berks 64 67
Buckingham 49 57
Cambridge 41 44
Chester 156 167
Cornwall 37 37
Cumberland 28 27
Derby 110 117
Devon 42 44
Dorset 36 38
Durham 228 229
Ely, Isle of 31 33
Essex 150 180
Gloucester 94 98
Hereford 21 21
Hertford 82 88
Huntingdon 23 24
Kent 117 125
Lancaster 411 420
Leicester 93 102
Lincoln, Holland 32 34
Lincoln, Kesteven 23 24
Lincoln, Lindsey 42 43
London 5,991 5,874
Middlesex 843 1102
Norfolk 38 38
Northampton 52 53
Northumberland 58 59
Nottingham 119 132
Oxford 40 44
Peterborough, Soke of 88 97
Rutland 19 18
Salop 28 28
Somerset 45 46
Southampton 95 105
Stafford 183 194
Suffolk, East 52 53
Suffolk, West 28 27
Surrey 201 256
Sussex, East 100 103
Sussex, West 49 55
Warwick 223 246
Westmorland 13 13
Wight, Isle of 101 94
Wilts 34 35
Worcester 89 94
Yorks, East Riding 61 64
Yorks, North Riding 34 34
Yorks, West Riding, including Yorks C.B. 183 193
Anglesey 29 28
Brecknock 13 12
Caernarvon 35 33
Cardigan 14 12
Carmarthen 30 30
Denbigh 37 37
Flint 65 69
Glamorgan 241 235
Merioneth 11 10
Monmouth 129 124
Montgomery 10 10
Pembroke 23 22
Radnor 8 7