Blackwells Mills, NJ Profile: Facts & Data


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Blackwells Mills, New Jersey - Basic Facts

The Blackwells Mills Census Designated Place had a population of 781 as of July 1, 2020. Blackwells Mills ranks in the lower quartile for Population Density and the upper quartile for Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in New Jersey. See peer rankings below.

The primary coordinate point for Blackwells Mills is located at latitude 40.4757 and longitude -74.5713 in Somerset County. The formal boundaries for the Blackwells Mills Census Designated Place encompass a land area of 1.22 sq. miles and a water area of 0.07 sq. miles. Somerset County is in the Eastern time zone (GMT -5). The elevation is 46 feet.

The Blackwells Mills Census Designated Place (GNIS ID: 2583968) 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 Blackwells Mills Census Designated Place is located within Township of Franklin, a minor civil division (MCD) of Somerset County.

Alternate Unofficial Names for Blackwells Mills: Blackwell, Blackwells, Blackwell's Mills.


Blackwells Mills, NJ Data & Demographics (As of July 1, 2020)


Total Population 781 (100%)
Population in Households 777 (99.5%)
Population in Families 711 (91.0%)
Population in Group Quarters1 4 ( 0.5%)
Population Density 639
Diversity Index2 64


Median Household Income $188,633
Average Household Income $224,240
% of Income for Mortgage4 13%
Per Capita Income $70,624
Wealth Index5 363


Total HU (Housing Units) 241 (100%)
Owner Occupied HU 197 (81.7%)
Renter Occupied HU 29 (12.0%)
Vacant Housing Units 15 ( 6.2%)
Median Home Value $587,230
Average Home Value $578,299
Housing Affordability Index3 178


Total Households 226
Average Household Size 3.44
Family Households 190
Average Family Size 4
  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 -0.27% -0.41%
Households -0.5% -0.45%
Families -1.33% -0.53%
Median Household Income   1.18%
Per Capita Income   1.64%
Owner Occupied HU   -0.31%


Blackwells Mills, NJ - Peer Comparisons by Rank and Percentile

The table below compares Blackwells Mills to the other 545 incorporated cities, towns and CDPs 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 # 478 12th
Population Density # 464 15th
Median Household Income # 20 97th
Housing Affordability Index # 491 90th
Per Capita Income # 69 88th
Diversity Index # 139 75th

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

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