Immigration Trends

Delaware County (PA)

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

131,424 foreign-born residents on file this year

Italy

33,391

United Kingdom

22,806

Ireland (Eire)

18,134

Germany

10,649

U.S.S.R.

9,515

1950

28,007 foreign-born residents on file this year

Italy

5,809

Ireland (Eire)

4,140

England and Wales

3,417

Germany

2,020

Poland

1,856

1940

27,087 foreign-born residents on file this year

Italy

5,005

England

3,640

Irish Free State (Eire)

3,024

Poland

2,305

Germany

2,089

1930

31,009 foreign-born residents on file this year

Italy

5,327

England

4,436

Irish Free State

3,946

Poland

2,881

Germany

2,328

1920

25,952 foreign-born residents on file this year

Ireland

4,707

Italy

4,435

Poland

3,474

England

3,327

Russia

2,687

1910

17,820 foreign-born residents on file this year

Ireland

5,087

England

2,890

Italy

2,550

Austria

1,872

Russia

1,738

1900

23,016 foreign-born residents on file this year

Ireland

5,624

Other Colored >> Male

5,043

Other Colored >> Female

4,904

England

3,109

Germany

1,150