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Mercer County, New Jersey Demographics 2026

Mercer County, New Jersey has a population of 383,286, the 12th most populous county in New Jersey. The median household income is $96,333 and the median home value is $351,000. The poverty rate is 11.1%.

Mercer County Quick Facts

Population 383,286
Median Household Income $96,333
Median Home Value $351,000
Poverty Rate 11.1%
Unemployment Rate 6.1%
Median Age 39.2 years
Homeownership Rate 61.9%
Affordability Ratio 3.6x
Bachelor's Degree+ 44.9%
High School Graduation 89.9%
Cities/Places 7
Population 383,286 12th of 21
Median Income $96,333 5% lower state
Poverty Rate 11.1%
Unemployment 6.1%

Economy & Housing

Employment

6.1% Unemployment Rate State: 6.2% | National: 5.2%
64.2% Labor Force Participation

Housing Overview

Owner 61.9%
Renter 38.1%
Affordability Index Affordable
3.6x home value to income ratio

People & Demographics

Diversity Index

70out of 100
Very High Diversity

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

State average: 65 | National average: 60

Education

Cities & Places in Mercer County

CityPopulationMedian IncomePovertyHome Value
Trenton city89,966$47,10224.7%$122,500
Princeton30,451$184,1136.8%$1,040,400
Princeton Meadows CDP15,382$124,0652.6%$636,300
Hightstown borough5,869$107,4311.5%$333,200
Pennington borough2,798$171,2824.5%$608,200
Princeton Junction CDP1,842$219,37511.6%$669,100
Hopewell borough1,828$142,3962.1%$561,900

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 383,286. It is the 12th most populous county out of 21 in New Jersey. The county encompasses 7 Census-designated places.

Age Demographics

The median age in Mercer County is 39.2 years. This is 2% lower than the state median of 40.1 years.

Economy, Income & Housing

The median household income in Mercer County is $96,333. This is 5% lower than the state median of $101,050. Compared to the national median of $78,538, household income here is 23% higher. The poverty rate stands at 11.1%. This is 13% higher than the state poverty rate of 9.8%. The unemployment rate is 6.1%. The median home value is $351,000. Housing costs are 18% lower than the state median of $427,600. The home-value-to-income ratio is 3.6x. 61.9% of occupied housing units are owner-occupied. This homeownership rate is 3% lower than the state average of 63.7%.

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 22.3%.

Education

44.9% of residents aged 25 and older hold a bachelor's degree or higher. This is 5% higher than the state rate of 42.9%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 89.9%. Notably, 20.6% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Frequently Asked Questions

What is the population of Mercer County, New Jersey?

Mercer County has a population of 383,286, 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 $96,333 with a poverty rate of 11.1%.

How many cities are in Mercer County, New Jersey?

Mercer County contains 7 Census-designated places.