# Counties in Maryland by population under 18, 2025

All 24 values come from U.S. Census Bureau for 2025, so the places are comparable.

- Indicator id: `population_0_17_share`
- Unit: %
- Definition: Residents aged 0 to 17 as a percentage of total population on 1 July. United States: Census Bureau county population estimates by age; states and the nation are sums of their counties.
- Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties (https://www.census.gov/programs-surveys/popest/data/data-sets.html)
- Retrieved: 2026-10-12
- Citation: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
- Web page: https://invokely.ai/rankings/population-under-18/maryland-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Caroline County | 23.8 |
| 2 | St. Mary's County | 23.4 |
| 3 | Charles County | 23 |
| 4 | Howard County | 22.7 |
| 5 | Calvert County | 22.5 |
| 6 | Frederick County | 22.4 |
| 7 | Cecil County | 22 |
| 8 | Montgomery County | 21.9 |
| 9 | Carroll County | 21.6 |
| 10 | Anne Arundel County | 21.6 |
| 11 | Wicomico County | 21.6 |
| 12 | Harford County | 21.5 |
| 13 | Washington County | 21 |
| 14 | Baltimore County | 21 |
| 15 | Prince George's County | 20.9 |
| 16 | Dorchester County | 20.6 |
| 17 | Queen Anne's County | 20.6 |
| 18 | Baltimore city | 19.9 |
| 19 | Allegany County | 18.1 |
| 20 | Talbot County | 17.7 |
| 21 | Somerset County | 17.7 |
| 22 | Garrett County | 17.7 |
| 23 | Worcester County | 16.7 |
| 24 | Kent County | 14.8 |