Maryland Population By County in 2021
Updated on June 16, 2025.
Based on the US Census Vintage data estimates, in 2021, the population of Maryland was 6,179,403. Among all Maryland counties, Montgomery had the highest population (1,056,087), followed by Prince George's (956,603), and Baltimore (850,670). Kent was the least populated county (19,249).
Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.
You can see similar information for other states and by state for the United States.
Related Topics: Maryland Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage).
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Maryland Population By County in 2021
Maryland Population By County in 2021
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| County | Population | % of State Population |
|---|---|---|
| Allegany | 67671 | 1.10 |
| Anne Arundel | 596354 | 9.65 |
| Baltimore | 850670 | 13.77 |
| Calvert | 94249 | 1.53 |
| Caroline | 33443 | 0.54 |
| Carroll | 174282 | 2.82 |
| Cecil | 104073 | 1.68 |
| Charles | 168822 | 2.73 |
| Dorchester | 32590 | 0.53 |
| Frederick | 280666 | 4.54 |
| Garrett | 28766 | 0.47 |
| Harford | 263348 | 4.26 |
| Howard | 335370 | 5.43 |
| Kent | 19249 | 0.31 |
| Montgomery | 1056087 | 17.09 |
| Prince George's | 956603 | 15.48 |
| Queen Anne's | 50921 | 0.82 |
| St. Mary's | 114674 | 1.86 |
| Somerset | 24563 | 0.40 |
| Talbot | 37792 | 0.61 |
| Washington | 155117 | 2.51 |
| Wicomico | 104110 | 1.69 |
| Worcester | 53408 | 0.86 |
| Baltimore city | 576575 | 9.33 |