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Investigating the Overlooked

Region What Who For Analysis
Immigration Trends
Contra Costa County (CA)
Top countries of origin for this county's foreign-born population, decade by decade, 1900-1960 -- the same IPUMS NHGIS census tables behind Population Trends, read for country-of-birth instead of race. No comparable county-level series exists past 1960 in this data (same real gap Population Trends names for its own 1960-2023 span).
1960
87,646 foreign-born residents on file this year
Italy
13,391
Mexico
9,704
Canada
9,258
United Kingdom
9,046
Germany
7,285
1950
22,639 foreign-born residents on file this year
Italy
3,935
Other
3,404
Mexico
2,420
Canada - other
2,093
Other European Countries
1,557
1940
16,863 foreign-born residents on file this year
Italy
4,157
Other
1,852
Mexico
1,815
Portugal
1,042
Canada (other)
1,030
1930
14,919 foreign-born residents on file this year
Italy
4,595
Portugal
1,305
England
1,095
Canada
1,057
Germany
861
1920
14,685 foreign-born residents on file this year
Italy
4,576
Portugal
1,459
Ireland
941
England
863
Germany
792
1910
10,007 foreign-born residents on file this year
Italy
2,826
Portugal
1,517
Ireland
926
Germany
825
England
538
1900
6,924 foreign-born residents on file this year
Ireland
983
Portugal
939
Other Colored >> Male
925
Italy
642
Germany
617