Middlesex County's 2026 population is estimated at 918,119, reflecting a 1.55% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Middlesex County is the 2nd largest county in New Jersey. The 2010 population was 810,813 and has grown 13.23% since 2010.
Data after 2023 is projected based on recent change
Overall: 39.5 years
Female: 40.4 years
Male: 38.7 years
There are 684,210 adults, (140,558 of whom are seniors) in Middlesex County.
Female: 438,397 (50.3%)
Male: 432,893 (49.7%)
The racial composition of Middlesex County includes 40.95% White, 25.54% Asian, 11.83% other race, 10.43% Black or African American, and smaller percentages for Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 356,769 | 40.95% |
| Asian | 222,566 | 25.54% |
| Other race | 103,095 | 11.83% |
| Black or African American | 90,902 | 10.43% |
| Two or more races | 88,655 | 10.18% |
| Native American | 9,028 | 1.04% |
| Native Hawaiian or Pacific Islander | 275 | 0.03% |
Middlesex County 's average per capita income is $64,998. Household income levels show a median of $111,549. The poverty rate stands at 8.59%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $153,032 | $184,287 |
| Families | $132,880 | $163,187 |
| Households | $111,549 | $142,003 |
| Non Families | $62,306 | $80,548 |
Average Income
Median Household Income
Poverty Rate