1921 Census of England and Wales, General Report with Appendices, Table 14 : " Population, 1861-1921. London and the "Outer Ring"".

  1861. 1871. 1881. 1891. 1901. 1911. 1921.
Population of—
  Administrative county of London (including the City of London) 2,808,494 3,261,396 3,830,297 4,227,954 4,536,267 4,521,685 4,484,523
  Outer Ring 414,226 624,245 936,364 1,405,852 2,045,135 2,729,673 2,995,678
  Greater London 3,222,720 3,885,641 4,766,661 5,633,806 6,581,402 7,251,358 7,480,201
               
Increase (+) or Decrease (-) per cent. in preceding intercensal period              
  Administrative county of London (including the City of London) 16.1 17.4 10.4 7.3 -0.3 -0.8
  Outer Ring   50.7 50.0 50.1 45.5 33.5 9.7
  Greater London   20.6 22.7 18.2 16.8 10.2 3.2
               
Corresponding Increase (+) or Decrease (-) in:—              
  England and Wales   13.2 14.4 11.7 12.2 10.9 5.0
  All Urban Districts   28.1 25.6 18.5 19.9 12.3 6.6