Population of London boroughs in 2021: total population of London in was 8 799 800. The most populous boroughs were Croydon (390 506), Barnet (389 300), Ealing (366 127), Newham (350 626). The least populous is the City of London with population of 8618. However, the low resident population of the City is because of its role as commercial (mostly financial services) center of London. Working day population of the City reaches 0.5-1 million people.
Source: Office for National Statistics