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Rocky Hill, NJ Profile: Facts & Data

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Rocky Hill, New Jersey - Basic Facts

The Borough of Rocky Hill had a population of 732 as of July 1, 2025.

The primary coordinate point for Rocky Hill is located at latitude 40.3998 and longitude -74.6343 in Somerset County. The formal boundaries for the Borough of Rocky Hill encompass a land area of 0.62 sq. miles and a water area of 0 sq. miles. Somerset County is in the Eastern time zone (GMT -5).

The Borough of Rocky Hill has a C5 Census Class Code which indicates an active incorporated place that is independent of any county subdivision and serves as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.


Jump to... (On This Page!)
  1. Rocky Hill 2025 Demographic Data
  2. Growth Rates for Rocky Hill (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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Rocky Hill, NJ Data & Demographics (As of July 1, 2025)

POPULATION

Total Population 732 (100%)
Population in Households 731 (99.9%)
Population in Families 631 (86.2%)
Population in Group Quarters1 1 ( 0.1%)
Population Density 1,201
Diversity Index2 47
 
 

INCOME

Median Household Income $152,414
Average Household Income $225,488
% of Income for Mortgage4 27%
Per Capita Income $85,640
Wealth Index5 231
Socioeconomic Status Index6 High (68.1)
 

HOUSING

Total HU (Housing Units) 295 (100%)
Owner Occupied HU 213 (72.2%)
Renter Occupied HU 65 (22.0%)
Vacant Housing Units 17 ( 5.8%)
Median Home Value $648,185
Average Home Value $794,836
Housing Affordability Index3 78
 

HOUSEHOLDS

Total Households 278
Average Household Size 2.63
Family Households 197
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 -0.28% -0.41%
Households 0.00% -0.22%
Families   -0.20%
Median Household Income   1.64%
Per Capita Income   1.32%
Owner Occupied HU   0.19%

Rocky Hill, NJ - Peer Comparisons by Rank and Percentile

The table below compares Rocky Hill 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 # 584 17th
Population Density # 471 33rd
Median Household Income # 146 79th
Housing Affordability Index # 366 52nd
Per Capita Income # 89 87th
Diversity Index # 431 39th

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

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