Union and the second most populous in Europe (or third if Istanbul is considered European). Country of Birth Population (2001) United Kingdom 5,230,155 India 172,162 Republic of Ireland 157,285 Pakistan 120,900 Bangladesh 84,565 Jamaica 80,319 Nigeria 68,907 Kenya 66,311 Sri Lanka 49,932 Ghana 46,513 Cyprus 45,888 South Africa 45,506 United States 44,622 Australia