Mercer County NJ Information


Mercer County Subdivisions

Mercer County NJ Data & Demographics (As of July 1, 2018)


Total Population 375,350
Population in Households 354,819
Population in Familes 289,759
Population in Group Qrtrs 20,531
Population Density1 1,672
Diversity Index2 73


Median Household Income $79,721
Average Household Income $115,667
Per Capita Income $43,716


Total Housing Units 146,498 (100%)
Owner Occupied HU 84,318 (57.6%)
Renter Occupied HU 51,493 (35.1%)
Vacant Housing Units 10,687 ( 7.3%)
Median Home Value $303,504
Average Home Value $388,238


Total Households 135,811
Average Household Size 2.61
Family Households 90,872
Average Family Size 3
  1. Population Density = Total Population per square mile.
  2. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 0.29% 0.25%
Households 0.24% 0.26%
Families 0.19% 0.23%
Median Household Income   2.06%
Per Capita Income   2.39%


Mercer County NJ - Peer Comparisons by Rank and Percentile

The table below compares Mercer County to the other 21 counties and county equivalents in New Jersey by rank and percentile using July 1, 2018 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 12 48th
Population Density # 8 67th
Diversity Index # 7 71st
Median Household Income # 10 57th
Per Capita Income # 6 76th

Additional comparisons and rankings can be made with a VERY EASY TO USE New Jersey Census Data Comparison Tool.