How many people live in Middlesex County, NJ?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 890,100 people living in Middlesex County, NJ. That makes Middlesex County the second-most populous county in New Jersey. It is home to 9.3% of people living in the state.
890K
population of Middlesex County, NJ (2024)
9.3%
County share of the New Jersey population (2024)
About 890,100 people lived in Middlesex County, NJ in 2024.
Population estimates, 2000–2024
What are Middlesex County, NJ’s age demographics?
About 150,500 Middlesex County, NJ residents are aged 65 and older in 2024. That represents 16.9% of its population. For comparison, the age group represents 18% of New Jersey’s population and 18% in the US overall.
Another 187,400 Middlesex County residents, or 21.1% 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 lower share of Middlesex County, NJ's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Middlesex County, NJ’s racial and ethnic demographics?
Non-Hispanic Asian residents make up 26.6% of the Middlesex County, NJ population, higher than the national share of 6.5%. Middlesex County, NJ also has a larger share of people identifying as Hispanic (24.8%) than the US overall (20%).
In contrast, Middlesex County’s non-Hispanic white population accounts for 36.3%, below the 57.5% nationwide, and the non-Hispanic Black or African American population makes up 10.4% 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.
Middlesex 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 Middlesex County, NJ is Edison with about 110,000 residents in 2024.
Cities and towns in Middlesex County, NJ ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Edison | 110,002 |
| 2. | Woodbridge | 106,101 |
| 3. | Old Bridge | 70,506 |
| 4. | Piscataway | 62,733 |
| 5. | New Brunswick | 57,487 |
| 6. | Perth Amboy | 56,939 |
| 7. | East Brunswick | 51,086 |
| 8. | Monroe | 50,157 |
| 9. | South Brunswick | 47,896 |
| 10. | Sayreville borough | 47,165 |
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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.
