Where Does About 10% of the UK Population Live?

London — the capital and largest city of both England and the United Kingdom — is home to roughly 9 million people (2018 estimate: 9,002,488), representing approximately 13–14% of the UK's total population (currently ~67 million).

Why London?

• Global financial center (The City, Canary Wharf)
• Seat of government, monarchy, law, media, culture
• Massive transport hub (Heathrow, 6+ airports, Underground, Crossrail)
• Magnet for domestic/international migration

No other UK city approaches this scale; Birmingham (metro ~4.3M) and Manchester (~3M) are the next largest urban areas.