Mercer County, NJ Population

Overview

384,951

Total Population

38.9

Median age

50.81%

Female population %

96.8:100

Gender ratio (M:F)

20-24 years

Largest age group

49.1

Total dependency ratio

White

Largest racial group

71,044

Hispanic population

Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

TABLE OF CONTENTS

Age

Mercer County's population is old compared to the rest of the country:

The median age in Mercer County is 38.9, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
Mercer County's population under 18 was 21.47%, compared to the 22.51% nationwide.
Mercer County's elderly or the senior population (over 65 age) was 15.31% as compared to 16.04% nationwide.
Of the total population in Mercer County, 17.62% were under the age of 15, 21.21% aged 15 to 29, 45.86% aged 30 to 64, 13.29% aged 65 to 84, and 2.01% were 85 years of age and older.

There are 6,269 more females than males in Mercer County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 50.81% females and 49.19% males in Mercer County, NJ.
The Mercer County, NJ gender ratio is 96.8:100 i.e. 96.8 men to 100 women (0.968).
For male population, the largest age group is 20-24 years with a population of 14,430.
For the female population, the largest age group is 20-24 years with a population of 14,665.

Mercer County's population has become increasingly diverse:

Racial distribution of Mercer County population: 57.37% are White, 20.06% are Black or African American, 0.22% are American Indian and Alaska Native, 11.80% are Asian, 0.03% are Native Hawaiian and other Pacific Islander, 5.07% are some other race and 5.45% are multiracial.
Mercer County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 71,044 is Hispanic or Latino (of any race), and 313,907 (81.54% of the total population) is Non-Hispanic.
The largest racial group in Mercer County is White with a population of 220,833 (57.37% of the total population).

Mercer County's population has already reached its peak and is showing a trend of decline:

The peak population was 386,441 in the year 2020
From 2000 to 2010, Mercer County's population increased by 16,129 (4.59%), as compared to the national growth of 9.63%.
From 2010 to 2020, Mercer County's population increased by 18,724 (5.09%), according to Census Bureau's Population Estimates Program. For the same period, the rate of growth for the United States was 7.17%.
Between the year 2000 and 2022, Mercer County's population was lowest in year 2000 at 351,588.