How many people live in Somerset County, NJ?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 357,500 people living in Somerset County, NJ. That makes Somerset County the 13th-most populous county in New Jersey. It is home to 3.7% of people living in the state.
357K
population of Somerset County, NJ (2024)
3.7%
County share of the New Jersey population (2024)
About 357,500 people lived in Somerset County, NJ in 2024.
Population estimates, 2000–2024
What are Somerset County, NJ’s age demographics?
About 64,500 Somerset County, NJ residents are aged 65 and older in 2024. That represents 18% of its population. For comparison, the age group represents 18% of New Jersey’s population and 18% in the US overall.
Another 73,700 Somerset County residents, or 20.6% of the population, were children under 18. For comparison, the age group represents 21.5% of New Jersey’s population and 21.6% in the US overall.
A higher share of Somerset County, NJ's population is aged 45–64 than the US as a whole.
Population estimates by age group, (2024)
What are Somerset County, NJ’s racial and ethnic demographics?
Non-Hispanic Asian residents make up 21.5% of the Somerset County, NJ population, higher than the national share of 6.5%.
In contrast, Somerset County’s non-Hispanic white population accounts for 48.1%, below the 57.5% nationwide, and the non-Hispanic Black or African American population makes up 9.8% of the county, compared with 12.6% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Somerset County, NJ has a higher share of a non-Hispanic Asian population than New Jersey as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Somerset County, NJ is Franklin with about 69,900 residents in 2024.
Cities and towns in Somerset County, NJ ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Franklin | 69,862 |
| 2. | Bridgewater | 46,871 |
| 3. | Hillsborough | 45,421 |
| 4. | Bernards | 28,718 |
| 5. | Montgomery | 24,254 |
| 6. | North Plainfield borough | 23,072 |
| 7. | Warren | 16,819 |
| 8. | Branchburg | 15,619 |
| 9. | Somerville borough | 14,428 |
| 10. | Bound Brook borough | 12,643 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
