100 Biggest Cities of the British Empire in 1921 with a Map

A lot of the Middle Eastern cities had declined in population at this point, but started to slowly pick up growth again, e.g. Kudüs (Jerusalem) grew from approx. 15k in 1872 to 62k by 1922. For the other regions, it's mostly due to them being way more rural at this point in time.

Thanks. I'm aware that the UK does have a slightly different definition of what it considers "cities", but I think that can be overlooked.

London suburbs are a complicated story here, but the 1921 census explicitly sets apart the suburbs from London proper as different urban districts. With Greater London not officially existing before April 1st 1965 with the London Government Act 1963, I wouldn't say it's necessarily incorrect consider them separate from London at least until this date.