Knox County's 2026 population is estimated at 40,855, reflecting a -0.15% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Knox County is the 11th largest county in Maine. The 2010 population was 39,727 and has grown 2.84% since 2010.
Data after 2023 is projected based on recent change
Overall: 49.5 years
Female: 51.9 years
Male: 47.3 years
There are 34,101 adults, (11,459 of whom are seniors) in Knox County.
Female: 20,433 (49.8%)
Male: 20,570 (50.2%)
The racial composition of Knox County includes 93.71% White, and smaller percentages for Asian, other race, Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 38,422 | 93.71% |
| Two or more races | 2,011 | 4.9% |
| Asian | 202 | 0.49% |
| Other race | 192 | 0.47% |
| Black or African American | 118 | 0.29% |
| Native American | 53 | 0.13% |
| Native Hawaiian or Pacific Islander | 5 | 0.01% |
Knox County 's average per capita income is $43,612. Household income levels show a median of $74,096. The poverty rate stands at 8.18%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $100,678 | - |
| Families | $93,188 | $121,688 |
| Households | $74,096 | $99,101 |
| Non Families | $46,641 | $64,483 |
Average Income
Median Household Income
Poverty Rate
