Mercer County, New Jersey Demographics 2026

Name: Mercer County, New Jersey Demographics
Creator: U.S. Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

Mercer County, New Jersey has a population of 385,864, the 12th most populous county in New Jersey. The median household income is $100,645 and the median home value is $377,700. The poverty rate is 10.3%.

Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes

Mercer County Quick Facts

Population 385,864

Median Household Income $100,645

Median Home Value $377,700

Poverty Rate 10.3%

Unemployment Rate 6.3%

Median Age 39.5 years

Homeownership Rate 62.2%

Affordability Ratio 3.8x

Bachelor's Degree+ 45.4%

High School Graduation 89.4%

Cities/Places 18

Population 385,864 12th of 21

Median Income $100,645 3% lower than state

Poverty Rate 10.3%

Unemployment 6.3%

How Mercer County Changed

Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.

Metric	2019–2023	2020–2024	Change
Population	383,286	385,864	+0.7%
Median household income	$96,333	$100,645	+4.5%
Median home value	$351,000	$377,700	+7.6%

Median Household Income

Mercer

$100,645

$103,556

National

$80,734

Median Home Value

Mercer

$377,700

$454,400

National

$332,700

Economy & Housing

Household Income Distribution

Under $25K 12.5%

$25K-$50K 13.9%

$50K-$100K 23.3%

$100K+ 50.3%

Detailed income brackets

Under $10K

5.2%

$10K-$15K

2.8%

$15K-$20K

2.1%

$20K-$25K

2.5%

$25K-$30K

2.6%

$30K-$35K

2.8%

$35K-$40K

3.0%

$40K-$45K

2.9%

$45K-$50K

2.6%

$50K-$60K

4.8%

$60K-$75K

7.6%

$75K-$100K

10.9%

$100K-$125K

9.6%

$125K-$150K

7.7%

$150K-$200K

11.7%

$200K+

21.3%

Employment

6.3% Unemployment Rate State: 6.3%|National: 5.2%

65.3% Labor Force Participation

Housing Overview

Owner 62.2%

Renter 37.8%

Affordability Index Affordable

3.8x home value to income ratio

Median gross rent $1,623/mo 19.4% of median household income annually

People & Demographics

Age Distribution

Under 18

22.0%

18-34

22.6%

35-54

26.5%

55-74

22.3%

75+

6.6%

Race & Ethnicity

Diversity Index

Very High Diversity

This community is exceptionally diverse, with no single racial or ethnic group dominating the population.

State average: 66 | National average: 61

Education

Educational Attainment (Adults 25+)

Cities & Places in Mercer County

City	Population	Median Income	Poverty	Home Value
Trenton	90,338	$52,537	21.6%	$160,700
Princeton	30,756	$192,079	6.1%	$1,050,600
Mercerville	13,535	$128,277	3.2%	$358,600
Hamilton Square	11,622	$138,162	2.3%	$397,000
White Horse	10,507	$105,758	2.6%	$308,200
Twin Rivers	8,382	$100,833	3.5%	$301,400
Yardville	6,301	$103,274	13.2%	$360,100
Hightstown	5,920	$108,987	2.1%	$342,600
Lawrenceville	3,924	$122,614	0.3%	$411,900
Robbinsville Center	3,777	$134,388	11.1%	$526,300
The College of New Jersey	3,658	N/A	87.2%	N/A
Groveville	3,100	$112,188	7.1%	$405,600
Pennington	2,827	$192,586	4.8%	$672,900
Princeton Junction	2,025	$224,732	8.3%	$709,800
Hopewell	1,823	$145,114	3.9%	$586,600
Washington Crossing	536	$186,458	0.0%	$427,800
Titusville	501	$120,234	0.0%	$341,200
Windsor	325	N/A	0.0%	$484,400

Explore New Jersey Rankings

Cities by Population All cities ranked by size Richest Cities Ranked by median income Most Educated By bachelor's degree rate Most Affordable By housing affordability

Population Overview

Mercer County is located in New Jersey with a total population of 385,864. It is the 12th most populous county out of 21 in New Jersey. The county encompasses 18 Census-designated places.

Age Demographics

The median age in Mercer County is 39.5 years. This is 1% lower than the state median of 40.1 years.

Economy, Income & Housing

The median household income in Mercer County is $100,645. This is 3% lower than the state median of $103,556. It is also 25% higher than the national median of $80,734. The poverty rate stands at 10.3%. This is 6% higher than the state poverty rate of 9.7%. The unemployment rate is 6.3%. The median home value is $377,700. Housing costs are 17% lower than the state median of $454,400. The home-value-to-income ratio is 3.8x. 62.2% of occupied housing units are owner-occupied. This homeownership rate is 3% lower than the state average of 63.8%.

Race & Ethnicity

Mercer County is a highly diverse community where no single racial or ethnic group constitutes a majority of the population. Hispanic or Latino residents account for 23.1%.

Education

45.4% of residents aged 25 and older hold a bachelor's degree or higher. This is 4% higher than the state rate of 43.6%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 89.4%. Notably, 21.2% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All figures for Mercer County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against New Jersey and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.

Frequently Asked Questions

What is the population of Mercer County, New Jersey?

Mercer County has a population of 385,864, making it the 12th most populous county in New Jersey.

What is the median income in Mercer County?

The median household income in Mercer County is $100,645 with a poverty rate of 10.3%.

How many cities are in Mercer County, New Jersey?

Mercer County contains 18 Census-designated places.