How many people live in Warren County, NJ?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 112,000 people living in Warren County, NJ. That makes Warren County the 19th-most populous county in New Jersey. It is home to 1.2% of people living in the state.
112K
population of Warren County, NJ (2024)
1.2%
County share of the New Jersey population (2024)
About 112,000 people lived in Warren County, NJ in 2024.
Population estimates, 2000–2024
What are Warren County, NJ’s age demographics?
About 23,300 Warren County, NJ residents are aged 65 and older in 2024. That represents 20.8% of its population. For comparison, the age group represents 18% of New Jersey’s population and 18% in the US overall.
Another 21,200 Warren County residents, or 18.9% 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 Warren County, NJ's population is aged 45–64 than the US as a whole.
Population estimates by age group, (2024)
What are Warren County, NJ’s racial and ethnic demographics?
Non-Hispanic white residents make up 73.4% of the Warren County, NJ population, higher than the national share of 57.5%.
In contrast, Warren County’s non-Hispanic Black or African American population accounts for 6.9%, below the 12.6% nationwide, and the Hispanic population makes up 14.7% of the county, compared with 20% 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.
Warren County, NJ has a higher share of a non-Hispanic white population than New Jersey as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Warren County, NJ is Phillipsburg with about 15,400 residents in 2024.
Cities and towns in Warren County, NJ ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Phillipsburg | 15,393 |
| 2. | Hackettstown | 10,182 |
| 3. | Lopatcong | 9,502 |
| 4. | Mansfield | 7,889 |
| 5. | Washington borough | 7,375 |
| 6. | Washington | 6,927 |
| 7. | Blairstown | 5,783 |
| 8. | Independence | 5,651 |
| 9. | Greenwich | 5,528 |
| 10. | Allamuchy | 5,475 |
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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.
