I'm adding the Madrid metro area (provinces of Madrid, Toledo, and Guadalajara) and the Barcelona metro area (province of Barcelona). Figures from the 2011 Spanish census.
Note that the Madrid and Barcelona figures refer to foreign-born people, like the London figures. Only the Paris figures refer strictly to immigrants (and overseas people), and therefore exclude French people born abroad as explained in the previous post.
People from each other's country:
- London metro area: 77,209 people born in France and 43,150 people born in Spain live there
- Paris metro area: 19,649 British immigrants and 45,549 Spanish immigrants live there
- Madrid metro area: 27,620 people born in France and 12,240 people born in the UK live there
- Barcelona metro area: 30,004 people born in France and 11,571 people born in the UK live there
People from Italy:
- London metro area: 75,320 people born in Italy live there
- Paris metro area: 54,640 Italian immigrants live there (for an example of the statistical bias that I've indicated, ca. 4,000 non-immigrant people born in Italy live in the Paris Region, but they are not included here)
- Madrid metro area: 12,263 people born in Italy live there
- Barcelona metro area: 19,859 people born in Italy live there
People from Portugal:
- London metro area: 48,175
- Paris metro area: 240,765
- Madrid metro area: 16,056
- Barcelona metro area: 8,263
People from Poland:
- London metro area: 201,900
- Paris metro area: 40,078
- Madrid metro area: 22,636
- Barcelona metro area: 7,399
People from Romania:
- London metro area: 51,220
- Paris metro area: 35,941
- Madrid metro area: 225,247
- Barcelona metro area: 33,075
People from Turkey:
- London metro area: 65,092
- Paris metro area: 69,756
- Madrid metro area: 807
- Barcelona metro area: 980
People from North Africa (incl. Egypt):
- London metro area: 60,386
- Paris metro area: 633,571
- Madrid metro area: 112,687
- Barcelona metro area: 136,900
People from sub-Saharan Africa:
- London metro area: 678,070
- Paris metro area: 438,418
- Madrid metro area: 37,227
- Barcelona metro area: 36,916
People from sub-Saharan Africa (excluding South Africa, Zimbabwe/Rhodesia, and Réunion):
- London metro area: 553,639
- Paris metro area: 406,952 (the ca. 45,000 French people born in sub-Saharan Africa, like Ségolène Royal and all the children of colonial administrators and settlers, are NOT included here, as explained in the introduction, whereas this category of people is included in the British figure, White settlers from Kenya for example)
- Madrid metro area: 36,751
- Barcelona metro area: 36,516
People from mainland China:
- London metro area: 48,093
- Paris metro area: 62,128
- Madrid metro area: 43,301
- Barcelona metro area: 37,071
People from Hong Kong:
- London metro area: 36,379
- Paris metro area: a few hundred
- Madrid metro area: a few hundred
- Barcelona metro area: a few hundred
People from South East Asia (excluding the Philippines):
- London metro area: 88,366
- Paris metro area: 115,421
- Madrid metro area: 1,209
- Barcelona metro area: 892
People from India, Pakistan, Bangladesh, and Sri Lanka:
- London metro area: 676,313
- Paris metro area: 75,284
- Madrid metro area: 11,244
- Barcelona metro area: 51,350
People from the USA:
- London metro area: 80,582 (this figure includes British people born in the USA, as explained in the introduction)
- Paris metro area: 18,252 (this figure does NOT include French people born in the USA)
- Madrid metro area: 11,572
- Barcelona metro area: 6,919
People from the Caribbean (including Cuba, Puerto Rico, and the Dominican Republic):
- London metro area: 155,914
- Paris metro area: 193,226
- Madrid metro area: 82,835
- Barcelona metro area: 41,162
People from continental Latin America (including the Guianas and Belize):
- London metro area: 107,531
- Paris metro area: 68,010
- Madrid metro area: 563,648
- Barcelona metro area: 375,781
People from Oceania:
- London metro area: 101,997
- Paris metro area: 7,574
- Madrid metro area: 1,566
- Barcelona metro area: 985