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

Population trends in
Figure 1: Annual population growth trend for (2010–2024).

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

Population pyramid for

Figure 2: Population distribution by age and gender for 2024.


Middlesex County, New Jersey Historical Population Data

YearMedian AgePopulation
202439.5871,290
202339.4861,535
202239.1860,147
202139.1858,770
202039.0825,015
201938.6825,920
201838.4826,698
201738.1837,288
201637.9831,852
201537.7830,300
201437.6824,046
201337.4817,026
201237.2811,064
201137.1804,299
201036.9798,882

Middlesex County, New Jersey Age Group Breakdown (2024)

Age CohortPercentage
Under 55.3%
5–1716.1%
18–249.4%
25–3412.9%
35–5427.1%
55–6412.9%
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.
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