How many people live in Monmouth County, NJ?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 647,500 people living in Monmouth County, NJ. That makes Monmouth County the sixth-most populous county in New Jersey. It is home to 6.8% of people living in the state.
648K
population of Monmouth County, NJ (2024)
6.8%
County share of the New Jersey population (2024)
About 647,500 people lived in Monmouth County, NJ in 2024.
Population estimates, 2000–2024
What are Monmouth County, NJ’s age demographics?
About 132,100 Monmouth County, NJ residents are aged 65 and older in 2024. That represents 20.4% of its population. For comparison, the age group represents 18% of New Jersey’s population and 18% in the US overall.
Another 132,700 Monmouth County residents, or 20.5% 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 Monmouth County, NJ's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Monmouth County, NJ’s racial and ethnic demographics?
Non-Hispanic white residents make up 73% of the Monmouth County, NJ population, higher than the national share of 57.5%.
In contrast, Monmouth County’s Hispanic population accounts for 13.3%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 6.3% 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.
Monmouth 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 Monmouth County, NJ is Middletown with about 66,900 residents in 2024.
Cities and towns in Monmouth County, NJ ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Middletown | 66,940 |
| 2. | Howell | 54,397 |
| 3. | Marlboro | 41,852 |
| 4. | Manalapan | 40,762 |
| 5. | Freehold | 35,800 |
| 6. | Long Branch | 33,214 |
| 7. | Neptune | 28,210 |
| 8. | Ocean | 27,992 |
| 9. | Wall | 26,722 |
| 10. | Hazlet | 20,641 |
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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.
