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Williamstown, NJ Profile: Facts & Data

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Williamstown, New Jersey - Basic Facts

The Williamstown CDP(1) had a population of 15,523 as of July 1, 2025.

The primary coordinate point for Williamstown is located at latitude 39.6874 and longitude -74.9786 in Gloucester County. The formal boundaries for the Williamstown Census Designated Place encompass a land area of 7.42 sq. miles and a water area of 0 sq. miles.

The Williamstown Census Designated Place has a U1 Census Class Code which indicates a census designated place with an official federally recognized name. It also has a Functional Status Code of "S" which identifies a statistical entity.

The Williamstown Census Designated Place is located within Township of Monroe, a minor civil division (MCD) of Gloucester County.


  1. A Census Designated Place (CDP) is a statistical counterpart to a self-governing (incorporated) place such as a city, town, or village. A CDP is not a legal entity and has no governmental functions.

Jump to... (On This Page!)
  1. Williamstown 2025 Demographic Data
  2. Growth Rates for Williamstown (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. New Jersey Research Tools (Easy Tools & Current Data)
  3. New Jersey Data Comparison Tool - 2025 Demographics
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Williamstown, NJ Data & Demographics (As of July 1, 2025)

POPULATION

Total Population 15,523 (100%)
Population in Households 15,366 (99.0%)
Population in Families 12,631 (81.4%)
Population in Group Quarters1 157 ( 1.0%)
Population Density 2,092
Diversity Index2 56
 
 

INCOME

Median Household Income $89,045
Average Household Income $108,603
% of Income for Mortgage4 21%
Per Capita Income $41,826
Wealth Index5 90
Socioeconomic Status Index6 Moderate (55.3)
 

HOUSING

Total HU (Housing Units) 6,264 (100%)
Owner Occupied HU 4,381 (69.9%)
Renter Occupied HU 1,586 (25.3%)
Vacant Housing Units 297 ( 4.7%)
Median Home Value $304,970
Average Home Value $339,657
Housing Affordability Index3 87
 

HOUSEHOLDS

Total Households 5,967
Average Household Size 2.58
Family Households 4,053
Average Family Size 3.00
NOTES
  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.
  6. The Socioeconomic Index ranges from zero (lowest relative status) to 100 (highest relative status). This measure quantifies disparities in social position of an area's inhabitants and is built from a broad range of demographic, housing, and socioeconomic inputs. More information on this measure can be found in Esri's SEI tutorial.

GROWTH RATE / YEAR

 2020-2025 2025-2030
Population 0.55% 0.32%
Households 1.13% 0.63%
Families   0.54%
Median Household Income   2.49%
Per Capita Income   1.96%
Owner Occupied HU   0.88%

Williamstown, NJ - Peer Comparisons by Rank and Percentile

The table below compares Williamstown to the other 700 incorporated cities, towns and CDPs in New Jersey by rank and percentile using July 1, 2025 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 # 75 89th
Population Density # 360 49th
Median Household Income # 505 28th
Housing Affordability Index # 469 67th
Per Capita Income # 570 19th
Diversity Index # 329 53rd

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

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