According to the 2021 UK Census, the City of Westminster has a population of approximately 204,900. The population density is remarkably high, standing at roughly 9,500 residents per square kilometer. However, this resident population swells dramatically during the day, with over a million commuters, tourists, and workers entering the borough daily.
Westminster is highly diverse, both ethnically and economically. While it houses some of the wealthiest individuals in the world in neighborhoods like Mayfair, it also contains significant pockets of deprivation and extensive social housing estates, particularly in areas like Churchill Gardens and parts of Paddington.
The demographic makeup reflects London's global status, with a large international community. A significant percentage of residents were born outside the UK, bringing a wide array of languages, religions, and cultural traditions to the borough. The population leans toward working-age professionals, with high levels of tertiary education and significant employment in professional, scientific, and technical sectors.