Cumberland County's 2026 population is estimated at 318,911, reflecting a 0.81% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Cumberland County is the largest county in Maine. The 2010 population was 281,481 and has grown 13.3% since 2010.
Data after 2023 is projected based on recent change
Overall: 42.2 years
Female: 43.6 years
Male: 41.1 years
There are 253,121 adults, (62,956 of whom are seniors) in Cumberland County.
Female: 158,290 (51.3%)
Male: 150,537 (48.7%)
The racial composition of Cumberland County includes 86.21% White, 3.46% Black or African American, and smaller percentages for Asian, other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 266,236 | 86.21% |
| Two or more races | 21,778 | 7.05% |
| Black or African American | 10,699 | 3.46% |
| Asian | 6,792 | 2.2% |
| Other race | 2,682 | 0.87% |
| Native American | 524 | 0.17% |
| Native Hawaiian or Pacific Islander | 116 | 0.04% |
Cumberland County 's average per capita income is $59,821. Household income levels show a median of $95,677. The poverty rate stands at 7.35%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $140,566 | $178,072 |
| Families | $124,273 | $161,242 |
| Households | $95,677 | $128,060 |
| Non Families | $56,036 | $75,294 |
Average Income
Median Household Income
Poverty Rate
