Middlesex County, New Jersey Age & Gender Distribution (2024)
Population distribution by age and gender for Middlesex County, New Jersey
Middlesex County, New Jersey Age & Gender Statistics (2024)
Total Population
871,290
Median Age
39.5
Male Median
38.7
Female Median
40.4
Middlesex County, New Jersey Population Growth

Middlesex County, New Jersey Demographic Trend
Since 2010, the population of has changed by +9.1%%.
+9.1%% Growth
Middlesex County, New Jersey Age & Gender Pyramid

Figure 2: Population distribution by age and gender for 2024.
Middlesex County, New Jersey Historical Population Data
| Year | Median Age | Population |
|---|---|---|
| 2024 | 39.5 | 871,290 |
| 2023 | 39.4 | 861,535 |
| 2022 | 39.1 | 860,147 |
| 2021 | 39.1 | 858,770 |
| 2020 | 39.0 | 825,015 |
| 2019 | 38.6 | 825,920 |
| 2018 | 38.4 | 826,698 |
| 2017 | 38.1 | 837,288 |
| 2016 | 37.9 | 831,852 |
| 2015 | 37.7 | 830,300 |
| 2014 | 37.6 | 824,046 |
| 2013 | 37.4 | 817,026 |
| 2012 | 37.2 | 811,064 |
| 2011 | 37.1 | 804,299 |
| 2010 | 36.9 | 798,882 |
Middlesex County, New Jersey Age Group Breakdown (2024)
| Age Cohort | Percentage |
|---|---|
| Under 5 | 5.3% |
| 5–17 | 16.1% |
| 18–24 | 9.4% |
| 25–34 | 12.9% |
| 35–54 | 27.1% |
| 55–64 | 12.9% |
| 65+ | 16.1% |
Dependency Ratios for Middlesex County, New Jersey
- Total Dependency Ratio:
- 60.3
- Youth Dependency:
- 34.4
- Old-Age Dependency:
- 25.9
The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).
Age & Gender FAQs for Middlesex County, New Jersey
The median age in Middlesex County, New Jersey is 39.5 years.
According to latest Census data, the total population of Middlesex County, New Jersey is 871,290.
In Middlesex County, New Jersey, seniors (ages 65+) make up 16.1% of the population, while children under 18 represent 16.1%.
Based on historical data since 2010, the population in Middlesex County, New Jersey is aging.