Based on 2022 estimates for city-proper populations:
| City | Population (millions) |
|---|---|
| London (UK) | 9.002 |
| Paris (France) | 2.175 |
| Dublin (Ireland) | 1.451 |
London has the largest population by a wide margin.
Note: Metro/urban area figures differ (London ~14M, Paris ~12M, Dublin ~2M), but London remains largest in all definitions.