Mercer County NJ Information


Mercer County Subdivisions

Mercer County NJ Data & Demographics (As of July 1, 2020)


Total Population 377,488 (100%)
Population in Households 357,117 (94.6%)
Population in Families 289,783 (76.8%)
Population in Group Quarters1 20,371 ( 5.4%)
Population Density 1,681
Diversity Index2 75


Median Household Income $82,482
Average Household Income $118,503
% of Income for Mortgage4 16%
Per Capita Income $43,392
Wealth Index5 146


Total HU (Housing Units) 146,204 (100%)
Owner Occupied HU 82,644 (56.5%)
Renter Occupied HU 53,889 (36.9%)
Vacant Housing Units 9,671 ( 6.6%)
Median Home Value $317,021
Average Home Value $409,093
Housing Affordability Index3 107


Total Households 136,533
Average Household Size 2.62
Family Households 91,246
Average Family Size 3
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  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 races 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.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2010-2020 2020-2025
Population 0.29% 0.2%
Households 0.24% 0.2%
Families 0.19% 0.17%
Median Household Income   1.42%
Per Capita Income   1.96%
Owner Occupied HU   0.29%


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, 2020 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
Median Household Income # 11 52nd
Housing Affordability Index # 9 43rd
Per Capita Income # 8 67th
Diversity Index # 7 71st

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

Quick & Easy Ways to...

  1. Get Current Demographic Data for Cities, Towns, and ZIP Codes
  2. View Boundary Maps, for Cities, Towns, and ZIP Codes
  3. Locate Physical, Cultural, and Historical Features

New Jersey Census Data Comparison Tool

Compare New Jersey July 1, 2020 Data
Highest or Lowest:

More Tools and Resources:

  1. For information about schools and school attendance zones, use the HTL Address Tool
  2. Our new HTL Neighborhood Explorer provides lots of detail about any neighborhood.
  3. The new 2-Minute Introduction and Concise Guide to Big Data which will help you make the most effective use of HomeTownLocator Tools.
  4. See the References & Data Sources page for more information about methodology and sources of data.
  5. See the New Jersey COVID-19 Data and US COVID-19 Data for more information on the spread of the novel coronavirus.