In 1880, the Irish made up a large portion of the foreign-born population of Baltimore at 24.6% of all foreign born residents.
[1] In 1920, 10,240 foreign-born White people in Baltimore spoke an English or Celtic language.
[3] In total, 4,077 people of Irish birth or descent lived in the city, comprising 4.6% of the foreign-stock white population.
[4] In the 1940 United States Census, Irish-Americans comprised 22% of the foreign-born population in Highlandtown.
This made them the second largest European ethnic group in the Baltimore area after the Germans.