Monmouth County's 2026 population is estimated at 652,678, reflecting a 0.4% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Monmouth County is the 6th largest county in New Jersey. The 2010 population was 630,454 and has grown 3.53% since 2010.
Data after 2023 is projected based on recent change
Overall: 43.2 years
Female: 44.6 years
Male: 41.9 years
There are 510,607 adults, (123,370 of whom are seniors) in Monmouth County.
Female: 329,001 (51%)
Male: 316,352 (49%)
The racial composition of Monmouth County includes 74.43% White, 5.99% Black or African American, 5.46% Asian, 4.86% other race, and smaller percentages for Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 480,349 | 74.43% |
| Two or more races | 55,623 | 8.62% |
| Black or African American | 38,675 | 5.99% |
| Asian | 35,205 | 5.46% |
| Other race | 31,366 | 4.86% |
| Native American | 3,886 | 0.6% |
| Native Hawaiian or Pacific Islander | 249 | 0.04% |
Monmouth County 's average per capita income is $75,260. Household income levels show a median of $124,845. The poverty rate stands at 6.49%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $179,231 | $225,347 |
| Families | $157,997 | $202,952 |
| Households | $124,845 | $170,714 |
| Non Families | $64,207 | $95,696 |
Average Income
Median Household Income
Poverty Rate