Ranking of Maryland Counties By Population with Unclassified Ancestry in 2021

Updated on April 16, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, there were 1.25M people in Maryland with Unclassified ancestry. Among all Maryland counties, Baltimore County had the highest population with Unclassified ancestry (178.19K), followed by Prince George's County (162.54K), and Montgomery County (160.76K).

The chart and table below shows the top 10 counties with high number of people with Unclassified 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 Unclassified Ancestry in 2021
Baltimore County
Prince George's County
Montgomery County
Anne Arundel County
Baltimore city
Frederick County
Harford County
Howard County
Washington County
Charles County
Ranking of Maryland Counties By Population with Unclassified Ancestry in 2021
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Rank County Population
1 Baltimore County 178185
2 Prince George's County 162543
3 Montgomery County 160759
4 Anne Arundel County 149313
5 Baltimore city 116259
6 Frederick County 61087
7 Harford County 55325
8 Howard County 53544
9 Washington County 47954
10 Charles County 40882
11 Carroll County 35327
12 St. Mary's County 29712
13 Calvert County 25962
14 Cecil County 25197
15 Wicomico County 21770
16 Allegany County 20350
17 Queen Anne's County 12936
18 Worcester County 12896
19 Garrett County 9347
20 Caroline County 8312
21 Dorchester County 7375
22 Talbot County 7275
23 Kent County 4610
24 Somerset County 4419