East Rocky Hill CDP, NJ Profile: Facts & Data


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East Rocky Hill CDP, New Jersey - Basic Facts

The East Rocky Hill Census Designated Place had a population of 505 as of July 1, 2020. East Rocky Hill CDP 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 East Rocky Hill CDP is located at latitude 40.4079 and longitude -74.6128 in Somerset County. The formal boundaries for the East Rocky Hill Census Designated Place encompass a land area of 4.16 sq. miles and a water area of 0.09 sq. miles.

The East Rocky Hill Census Designated Place (GNIS ID: 2583986) has a U2 Census Class Code which indicates a census designated place without an official federally recognized name. It also has a Functional Status Code of "S" which identifies a statistical entity.

The East Rocky Hill Census Designated Place is located within Township of Franklin, a minor civil division (MCD) of Somerset County.


East Rocky Hill CDP, NJ Data & Demographics (As of July 1, 2020)


Total Population 505 (100%)
Population in Households 504 (99.8%)
Population in Families 451 (89.3%)
Population in Group Quarters1 1 ( 0.2%)
Population Density 121
Diversity Index2 70


Median Household Income $162,950
Average Household Income $232,123
% of Income for Mortgage4 15%
Per Capita Income $75,020
Wealth Index5 311


Total HU (Housing Units) 177 (100%)
Owner Occupied HU 143 (80.8%)
Renter Occupied HU 23 (13.0%)
Vacant Housing Units 11 ( 6.2%)
Median Home Value $573,276
Average Home Value $573,776
Housing Affordability Index3 175


Total Households 166
Average Household Size 3.04
Family Households 131
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 0.72% 0.31%
Households 0.36% 0.12%
Families 1.28% 0.15%
Median Household Income   0.47%
Per Capita Income   1.12%
Owner Occupied HU   0.28%


East Rocky Hill CDP, NJ - Peer Comparisons by Rank and Percentile

The table below compares East Rocky Hill CDP 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 # 498 9th
Population Density # 536 2nd
Median Household Income # 36 94th
Housing Affordability Index # 484 89th
Per Capita Income # 58 90th
Diversity Index # 101 82nd

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

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