Most Populated Urban Areas in the British Isles: London Dominates, Then Dublin, Manchester, Birmingham

Population figures (metro/urban area estimates, ~2021–2023):

United Kingdom

• London: ~9.0M (metro ~14M)
• Manchester: ~2.8M (Greater Manchester)
• Birmingham: ~1.1M (city) / 2.9M (West Midlands metro)
• Leeds-Bradford: ~1.9M
• Glasgow: ~1.7M (metro)
• Liverpool: ~1.5M (metro)
• Sheffield: ~1.0M
• Edinburgh: ~0.9M (metro)
• Bristol: ~0.9M
• Newcastle: ~0.9M
• Belfast: ~0.6M (metro)

Republic of Ireland

• Dublin: ~1.4M (metro ~2.0M)
• Cork: ~0.4M (metro ~0.8M)
• Limerick: ~0.2M (metro ~0.3M)
• Galway: ~0.2M (metro ~0.3M)

Notes

"City proper" vs. "metro" definitions vary. London is in a tier of its own. Birmingham/Manchester rivalry for "second city" depends on definition. Dublin is the only Irish city >1M metro.