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1921 Census of England and Wales, General Report with Appendices, Table 9 : " Administrative Counties (Including County Boroughs) arranged in order of 1911-1921 Increase per cent. of Population, and showing the Increase per cent. of Population in the Intercensal Periods 1911-1921 and 1901-1911 respectively, and the Number of Persons per Acre at the 1921 Census".
| Administrative County. | Increase or Decrease (-) per cent. | Persons per Acre, 1921. | |
|---|---|---|---|
| 1911-21. | 1901-11. | ||
| Flintshire | 15.0 | 13.8 | 0.7 |
| Monmouthshire | 13.9 | 32.8 | 1.3 |
| Glamorganshire | 11.7 | 30.3 | 2.4 |
| Warwickshire | 11.4 | 15.2 | 2.3 |
| Middlesex | 11.2 | 42.1 | 8.4 |
| Sussex, West | 11.1 | 16.5 | 0.5 |
| Surrey | 10.0 | 29.4 | 2.0 |
| Sussex, East | 9.3 | 8.0 | 1.0 |
| Lincolnshire (Parts of Lindsey) | 9.3 | 16.4 | 0.4 |
| Kent | 9.2 | 8.8 | 1.2 |
| Carmarthenshire | 9.1 | 18.5 | 0.3 |
| Essex | 8.8 | 24.6 | 1.5 |
| Yorks, North Riding | 8.8 | 11.2 | 0.3 |
| Durham | 8.0 | 15.4 | 2.3 |
| Buckinghamshire | 7.6 | 11.4 | 0.5 |
| Isle of Wight | 7.3 | 7.0 | 1.0 |
| Northumberland | 7.1 | 15.5 | 0.6 |
| Hertfordshire | 7.0 | 20.5 | 0.8 |
| Denbighshire | 6.9 | 10.0 | 0.4 |
| Yorks, East Riding | 6.5 | 12.4 | 0.6 |
| Cheshire | 6.2 | 14.3 | 1.6 |
| Nottingham | 6.1 | 17.4 | 1.2 |
| Bedfordshire | 6.1 | 13.3 | 0.7 |
| Isle of Ely | 5.8 | 8.2 | 0.3 |
| Southampton | 5.5 | 20.3 | 0.9 |
| Staffordshire | 5.4 | 8.1 | 1.8 |
| Soke of Peterboro. | 5.0 | 8.7 | 0.9 |
| Berkshire | 5.0 | 8.4 | 0.6 |
| Suffolk, East | 5.0 | 8.3 | 0.5 |
| Worcestershire | 4.7 | 6.7 | 0.9 |
| Carnarvonshire | 4.7 | -0.5 | 0.4 |
| Derbyshire | 4.6 | 14.0 | 1.1 |
| Yorks, West Riding | 4.5 | 10.3 | 1.8 |
| Radnorshire | 4.1 | -3.0 | 0.1 |
| Leicestershire | 3.8 | 8.9 | 0.9 |
| Lancashire | 3.6 | 8.9 | 4.1 |
| Lincolnshire (Parts of Holland) | 3.6 | 6.8 | 0.3 |
| Westmorland | 3.4 | -1.3 | 0.1 |
| Brecknockshire | 3.3 | 9.4 | 0.1 |
| Gloucestershire | 2.9 | 3.9 | 0.9 |
| Cumberland | 2.8 | -0.4 | 0.3 |
| Dorsetshire | 2.2 | 10.5 | 0.4 |
| Pembrokeshire | 2.2 | 2.4 | 0.2 |
| York, City and County of | 2.1 | 5.6 | 22.5 |