1921 Census of England and Wales, General Report with Appendices, Table 11 : " Classification of Urban Districts by Population. England and Wales".

Population of Urban Districts. Number
of
Districts.		 Aggregate
Population,
1921.		 Aggregate
Population of the
same areas,
1911.		 Mean
Percentages
of Increase (+)
or Decrease (-)
of Population,
1911-21.		 Percentage
of Total
Population,
England
and Wales,
in each
group of
areas, 1921.
Over 1,000,000 1* 4,484,523 4,521,685 - 0.8 14.93
500,000 and under 1,000,000 3 2,452,691 2,307,940 + 6.3 8.17
250,000 " 500,000 8 2,737,450 2,653,435 + 3.2 9.11
150,000 " 250,000 13 2,541,481 2,414,043 + 5.3 8.46
100,000 " 150,000 21 2,623,842 2,473,608 + 6.1 8.74
75,000 " 100,000 20 1,738,443 1,611,151 + 7.9 5.79
50,000 " 75,000 35 2,116,218 1,959,661 + 8.0 7.05
40,000 " 50,000 31 1,374,770 1,279,351 + 7.5 4.58
30,000 " 40,000 50 1,736,997 1,606,151 + 8.1 5.78
20,000 " 30,000 76 1,854,491 1,736,371 + 6.8 6.17
15,000 " 20,000 95 1,649,258 1,515,622 + 8.8 5.49
10,000 " 15,000 141 1,769,879 1,645,302 + 7.6 5.89
5,000 " 10,000 262 1,863,045 1,756,551 + 6.1 6.20
4,000 " 5,000 90 403,687 387,268 + 4.2 1.34
3,000 " 4,000 93 323,766 313,602 + 3.2 1.08
2,000 " 3,000 90 228,187 223,776 + 2.0 0.76
Under 2,000 97 136,689 134,810 + 1.4 0.46
             
Total 1,126 30,035,417 28,540,327 + 5.2 100

*Administrative County of London here reckoned as one district.