Demographic Composition & Population Features of Cities - Video & Lesson  Transcript | Study.com A city is defined by its population: number of inhabitants, their characteristics and geographical distribution. Demography is a key factor in planning for a city’s future, since the current and future number of people per age, ethnic group and their sexual identity determines all dimensions of the uburn life. 

    According to the World Population Review London’s 2020 population is now estimated to be at 9,304,106. (ND, London Population 2020) According to the last census conducted in 2011, the population of London was counted to equal 8,173,941 and the next census is not scheduled until 2021. London’s growing population makes it the largest city located in the United Kingdom(Clout & Ehrlich, London 2019).