Which County Has the Most Inhabitants in the British Isles? England (Country, Not County)

England is the most populous country in the British Isles — but it is a country, not a county.

Population (2022 estimates)

• England: 57.1 million
• Scotland: 5.5 million
• Wales: 3.1 million
• Northern Ireland: 1.9 million
• Republic of Ireland: 5.1 million
• Isle of Man / Channel Islands: ~0.25 million combined

England = 84% of British Isles population.

If You Meant "County" (Subnational Unit)

• Greater London (ceremonial county + region): ~8.9M
• Greater Manchester: ~2.9M
• West Midlands: ~2.9M
• West Yorkshire: ~2.3M
• Hampshire: ~1.9M
• Kent: ~1.9M
• Essex: ~1.9M
• Lancashire: ~1.5M

Density

England: 434/km² (2nd in UK after city-regions). London: 5,700/km².

Clarification: The British Isles = UK + Ireland + Crown Dependencies. England is a constituent country of the UK. "County" = administrative/ceremonial subdivision.