Ranking of Maryland Counties By Population with Irish Ancestry in 2021

Updated on April 16, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, there were 593.04K people in Maryland with Irish ancestry. Among all Maryland counties, Baltimore County had the highest population with Irish ancestry (97.38K), followed by Montgomery County (82.87K), and Anne Arundel County (78.70K).

The chart and table below shows the top 10 counties with high number of people with Irish ancestry.

You can see similar information for other states and for other ancestry groups in Maryland.

Data Source: US Census Bureau.
Ranking of Maryland Counties By Population with Irish Ancestry in 2021
Baltimore County
Montgomery County
Anne Arundel County
Harford County
Frederick County
Howard County
Baltimore city
Carroll County
Prince George's County
Cecil County
Ranking of Maryland Counties By Population with Irish Ancestry in 2021
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Rank County Population
1 Baltimore County 97384
2 Montgomery County 82873
3 Anne Arundel County 78698
4 Harford County 38844
5 Frederick County 37449
6 Howard County 34961
7 Baltimore city 33625
8 Carroll County 30599
9 Prince George's County 24938
10 Cecil County 17954
11 Washington County 17221
12 St. Mary's County 16607
13 Calvert County 13081
14 Charles County 11722
15 Wicomico County 11120
16 Worcester County 8593
17 Allegany County 8365
18 Queen Anne's County 7712
19 Talbot County 6557
20 Caroline County 3974
21 Garrett County 3942
22 Kent County 2721
23 Dorchester County 2716
24 Somerset County 1386