Rocky Hill ZIP Codes — Somerset County, NJ

There is one unique ZIP code in Rocky Hill, New Jersey and it is 08553. Area code: 609.

ZIP codes

0.61

sq mi land

0.00

sq mi water

609

area code

Rocky Hill, NJ ZIP code map

About Rocky Hill, NJ

Rocky Hill is a small borough located in the peaceful atmosphere of Somerset County, New Jersey. Known for its quaint charm and rich history, the borough serves as a quiet retreat for those seeking respite from bustling urban environments. With its close-knit community and a variety of local amenities, Rocky Hill offers a unique blend of rural and suburban living.

Location & geography

Geographically, Rocky Hill is nestled in central New Jersey, bordered by the larger town of Montgomery Township and located approximately 5 miles from Princeton. The borough itself encompasses a land area of 0.61 square miles, featuring primarily flat terrain that is typical of this region of New Jersey. Notably, Rocky Hill does not have any water bodies, embodying a land-focused layout that serves its residents well.

Community & economy

The character of Rocky Hill is defined by its friendly residents, who take pride in their historic landmarks and community events. While predominantly residential, the area is also home to small businesses and local service industries that cater to the daily needs of the population. Residents often engage in community activities, fostering a strong sense of belonging among the townspeople.

Transportation

Rocky Hill is conveniently accessible via major highways, including Route 518, which connects to larger routes such as I-95, making it easy for residents to commute to nearby cities. The nearest airport serving the area is Trenton-Mercer Airport, located about 15 miles away, providing regional connectivity. Public transportation options may be limited but can be found through local bus services for those needing access to larger metropolitan areas.

History

Rocky Hill was founded in the early 18th century and has roots as a historic transportation hub, facilitating travel and trade in the region. Key industries during its initial growth included agriculture and services tied to transport needs, which laid the groundwork for the community's development. Over the years, the borough has preserved its historical sites and charm, offering insights into its past.

Did you know?

A little-known fact about Rocky Hill is that it was once a bustling stagecoach stop between the major cities of Trenton and New Brunswick. This historical significance adds to the borough's charm and appeals to history enthusiasts visiting the area.

ZIP codes for Rocky Hill, NJ (1)

ZIP code	City	County	Map
08553	Rocky Hill	Somerset	View map

Demographics & statistics

794

Population

43.4

Median age

$126,250

Median household income

$82,593

Per capita income

$587,000

Median home value

$1,521

Median monthly rent

86.1%

Home ownership

3.7%

Poverty rate

4.8%

Unemployment

265

Housing units

76.7%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

25–34

35–44

45–54

55–59

60–64

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	163	20.5%
18 and over	631	79.5%
65 and over	160	20.2%
Median age	43.4 years

Race & ethnicity

White 84.9%

Two or more races 5.2%

Hispanic or Latino 4.6%

Asian 2.6%

Other race 1.7%

Black or African American 1.1%

Group	Count	%
White	706	84.9%
Two or more races	43	5.2%
Hispanic or Latino	38	4.6%
Asian	22	2.6%
Other race	14	1.7%
Black or African American	9	1.1%

Household income

$15k–$25k 2.7%

$25k–$35k 5.1%

$35k–$50k 3.4%

$50k–$75k 11.5%

$75k–$100k 16.3%

$100k–$150k 16.3%

$150k–$200k 13.2%

$200k+ 31.5%

Range	% of households
$15k–$25k	2.7%
$25k–$35k	5.1%
$35k–$50k	3.4%
$50k–$75k	11.5%
$75k–$100k	16.3%
$100k–$150k	16.3%
$150k–$200k	13.2%
$200k+	31.5%
Median income	$126,250

Housing

Home values

$150k–$200k 1.2%

$200k–$300k 4.7%

$300k–$500k 25.2%

$500k–$1M 65.7%

$1M+ 3.1%

Housing overview

Metric	Value
Median home value	$587,000
Median rent / month	$1,521
Owner occupied	86.1%
Renter occupied	13.9%
Vacant	3.6%
Single-family detached	75.5%
Large apartment buildings	0.0%
Mobile homes	0.0%
Median rooms	7.5
Avg household size (owned)	2.83

Year built

Era	%
2020 or later	0.0%
2010–2019	1.3%
2000–2009	0.0%
1990–1999	1.0%
1980–1989	5.6%
1970–1979	5.6%
1960–1969	33.3%
1950–1959	7.2%
1940–1949	3.6%
1939 or earlier	42.5%

Bedrooms

Size	% of units
No bedroom (studio)	1.0%
1 bedroom	6.5%
2 bedrooms	18.0%
3 bedrooms	30.1%
4 bedrooms	37.9%
5+ bedrooms	6.5%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	33.9%
2 vehicles	47.1%
3 or more	19.0%

Heating fuel

Fuel type	%
Utility gas	81.0%
Electricity	11.5%
Fuel oil	7.5%

Households & families

Household type	Count	%
Married-couple family	152	51.5%
Cohabiting couple	14	4.7%
Male householder, no spouse	55	18.6%
Female householder, no spouse	74	25.1%
Households with children under 18	81	27.5%
Households with seniors (65+)	113	38.3%
Average household size	2.64

Marital status

Status	Male	Female
Never married	39.1%	29.5%
Married	47.3%	53.3%
Separated	1.2%	0.0%
Widowed	5.3%	3.8%
Divorced	7.1%	13.3%

Education

Less than 9th grade 0.4%

Some HS, no diploma 0.9%

HS graduate 11.7%

Some college, no degree 5.6%

Associate's degree 4.8%

Bachelor's degree 37.4%

Graduate / professional 39.3%

Metric	%
HS diploma or higher	98.7%
Bachelor's or higher	76.7%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	32	16.0%
Kindergarten	5	2.5%
Elementary school	70	35.0%
High school	40	20.0%
College / grad school	53	26.5%

Employment

Industry of employment

Education & healthcare 33.0%

Professional & management 19.5%

Arts, food & hospitality 10.5%

Finance & real estate 8.5%

Manufacturing 7.8%

Transportation & utilities 5.8%

Other services 4.8%

Wholesale trade 4.0%

Construction 2.0%

Information 1.5%

Public administration 1.5%

Retail trade 1.3%

Occupation

Category	%
Management, business & arts	67.5%
Service	11.0%
Sales & office	16.8%
Natural resources & construction	2.0%
Production & transportation	2.8%

Employment type

Type	%
Private sector	82.8%
Government	8.3%
Self-employed	9.0%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	66.1%
Carpool	5.3%
Public transit	1.5%
Walk	2.0%
Other means	0.8%
Avg commute (minutes)	24.0

Poverty

All people 3.7%

Under 18 years 0.0%

18 and over 4.6%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	31.2%
Retirement income	30.2%
Supplemental Security	4.1%
Cash public assistance	0.0%
Food stamps / SNAP	0.0%

Health indicators

Condition	%
High blood pressure	0.0%
High cholesterol	0.0%
Heart disease	5.9%
Stroke	2.3%
Asthma	8.2%
Arthritis	21.3%
Kidney disease	2.5%
Pulmonary disease	4.3%
Cancer	8.0%

Behavior / access	%
Binge drinking	16.1%
No physical activity	13.0%
Less than 7 hrs sleep	27.9%
Fair or poor health	8.0%
Poor mental health	10.9%
Poor physical health	6.7%
No health insurance	7.4%
Visited doctor (checkup)	76.2%
Visited dentist	76.4%
Cholesterol screening	0.0%
Teeth loss	5.8%

Veterans & disability

Veterans	Count	%
Civilian veterans	13	2.1%

Disability	%
Any disability	11.7%
Under 18	5.5%
18–64 years	11.7%
65 and over	18.1%

Health insurance coverage

Type	%
Private insurance	86.5%
Public insurance	25.8%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	736	92.7%
Spanish	46	6.3%
Other Indo-European	0	0.0%
Asian & Pacific Islander	41	5.6%
Other languages	5	0.7%

Place of birth & citizenship

Origin	Count	%
Native born (US)	671	84.5%
Born in same state	665	83.8%
Born in different state	345	43.5%
Foreign born	6	0.8%
Naturalized citizen	123	15.5%
Not a US citizen	86	69.9%

Ancestry

Ancestry	Count	%
Italian	97	12.2%
French	60	7.6%
Polish	24	3%

Ancestry	Count	%
Arab	22	2.8%
English	15	1.9%
German	7	0.9%

Technology access

Metric	% of households
Computer access	37.2%
Internet access	99.3%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions

What ZIP codes does Rocky Hill, NJ have?

Rocky Hill, NJ has one ZIP code: 08553. Each ZIP code serves a distinct delivery area within the city and surrounding region.