Middlesex County's 2026 population is estimated at 1,717,004, reflecting a 1.42% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Middlesex County is the largest county in Massachusetts. The 2010 population was 1,507,694 and has grown 13.88% since 2010.
Data after 2023 is projected based on recent change
Overall: 38.9 years
Female: 39.9 years
Male: 37.9 years
There are 1,319,500 adults, (267,007 of whom are seniors) in Middlesex County.
Female: 829,266 (50.6%)
Male: 809,099 (49.4%)
The racial composition of Middlesex County includes 66.75% White, 13.65% Asian, 4.9% Black or African American, 4.5% other race, and smaller percentages for Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 1,093,628 | 66.75% |
| Asian | 223,582 | 13.65% |
| Two or more races | 163,181 | 9.96% |
| Black or African American | 80,327 | 4.9% |
| Other race | 73,778 | 4.5% |
| Native American | 3,246 | 0.2% |
| Native Hawaiian or Pacific Islander | 623 | 0.04% |
Middlesex County 's average per capita income is $79,003. Household income levels show a median of $130,847. The poverty rate stands at 7.74%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $191,930 | $243,601 |
| Families | $166,449 | $215,545 |
| Households | $130,847 | $178,070 |
| Non Families | $78,728 | $107,251 |
Average Income
Median Household Income
Poverty Rate