Maryland Population By County in 2021 (ACS-5Yrs)
Updated on February 28, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the total population of Maryland was 6.15M. Among all Maryland counties, Montgomery was the most populated county (1.06M), followed by Prince George's (957.77K), and then Baltimore (850.70K).
On the other hand, the least populated counties were: Kent (19.34K), Somerset (24.83K), and Garrett (28.96K).
The chart and table below shows the population of each county and the percentage of Maryland population in each county.
You can see similar information for other states and by state for the United States.
Related Topics: Maryland ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates, 2021 Census.
Maryland Population By County in 2021
Maryland Population By County in 2021
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| County | Population | % of State Population |
|---|---|---|
| Allegany | 68684 | 1.12 |
| Anne Arundel | 584064 | 9.50 |
| Baltimore | 850702 | 13.84 |
| Calvert | 92515 | 1.51 |
| Caroline | 33234 | 0.54 |
| Carroll | 172148 | 2.80 |
| Cecil | 103370 | 1.68 |
| Charles | 165209 | 2.69 |
| Dorchester | 32486 | 0.53 |
| Frederick | 267498 | 4.35 |
| Garrett | 28955 | 0.47 |
| Harford | 259162 | 4.22 |
| Howard | 329248 | 5.36 |
| Kent | 19335 | 0.31 |
| Montgomery | 1057201 | 17.19 |
| Prince George's | 957767 | 15.58 |
| Queen Anne's | 49702 | 0.81 |
| St. Mary's | 113209 | 1.84 |
| Somerset | 24834 | 0.40 |
| Talbot | 37510 | 0.61 |
| Washington | 153956 | 2.50 |
| Wicomico | 103223 | 1.68 |
| Worcester | 52322 | 0.85 |
| Baltimore city | 592211 | 9.63 |