08558 ZIP Code — Skillman, NJ

Somerset County, New Jersey

ZIP code 08558 is located in Skillman, New Jersey, within Somerset County. It covers approximately 15.59 square miles and serves a population of 7,515 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 609.

About ZIP code 08558

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 2000s, giving the area an established character. Median home value is $774,900. Owner-occupancy is high at 87%, well above the national average.

The gap between median ($233,865) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 3% is below the national average. 32% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with manufacturing as the leading industry. An above-average commute of 37 minutes suggests many residents work outside the immediate area. Remote work is prevalent — 24% of workers work from home.

Educational attainment is high — 74% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 08558 reflects a community defined by a highly educated population, high homeownership, a high rate of remote workers, and a significant Social Security-dependent population.

7,515

population

15.59

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

08558 ZIP code map

Cities in ZIP code 08558

Below are the cities the US Postal Service accepts for ZIP code 08558. Using any city not on this list may result in mail delivery delays.

City	Status
Skillman	Acceptable
Skillman	Preferred

Nearby ZIP codes

08540 Princeton (2.7 mi) 08553 Rocky Hill (3 mi) 08502 Belle Mead (3.1 mi) 08528 Kingston (4.2 mi) 08542 Princeton (4.2 mi) 08541 Princeton (4.5 mi) 08525 Hopewell (4.8 mi) 08544 Princeton (4.9 mi) 08844 Hillsborough (6.3 mi) 08823 Franklin Park (7 mi) 08536 Plainsboro (7.5 mi) 08824 Kendall Park (7.6 mi)

Demographics updated 05/2026

Population
Total population	7,515
Population density	482 / sq mi
State FIPS	34
County FIPS	035

Geography
Land area	15.59 sq mi
Water area	0.07 sq mi
Latitude	40.4085
Longitude	-74.6947
Timezone	Eastern (ET)
Area code	609

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	14.8%	19.6%	30.2%
$50k – $100k	15.1%	22.9%	26.7%
$100k – $200k	18.0%	31.5%	28.3%
Over $200k	52.1%	26.0%	14.8%

Demographics & statistics

7,515

Population

482

People per sq mi

49.1

Median age

$233,865

Median household income

$101,748

Per capita income

$774,900

Median home value

$1,636

Median monthly rent

86.9%

Home ownership

3.3%

Poverty rate

5.2%

Unemployment

2,447

Housing units

73.8%

Bachelor's or higher

Age distribution

Male Female

101

Under 5

116

196

5–9

227

272

10–14

315

344

15–19

398

144

20–24

167

198

25–34

228

269

35–44

311

611

45–54

706

293

55–59

338

309

60–64

356

343

65–74

396

217

75–84

250

190

85+

220

← Male

Female →

Age summary

Group	Count	%
Under 18	1,687	22.4%
18 and over	5,828	77.6%
65 and over	1,616	21.5%
Median age	49.1 years

Race & ethnicity

White 66.3%

Asian 20.7%

Two or more races 4.6%

Hispanic or Latino 3.6%

Black or African American 3.2%

Other race 1%

American Indian / Alaska Native 0.6%

Group	Count	%
White	5,169	66.3%
Asian	1,614	20.7%
Two or more races	361	4.6%
Hispanic or Latino	277	3.6%
Black or African American	246	3.2%
Other race	78	1%
American Indian / Alaska Native	47	0.6%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	14.8%	19.6%	30.2%
$50k – $100k	15.1%	22.9%	26.7%
$100k – $200k	18.0%	31.5%	28.3%
Over $200k	52.1%	26.0%	14.8%

Under $10k 2.9%

$15k–$25k 4.0%

$25k–$35k 1.1%

$35k–$50k 3.4%

$50k–$75k 4.8%

$75k–$100k 2.3%

$100k–$150k 13.3%

$150k–$200k 11.7%

$200k+ 56.7%

Range	% of households
Under $10k	2.9%
$15k–$25k	4.0%
$25k–$35k	1.1%
$35k–$50k	3.4%
$50k–$75k	4.8%
$75k–$100k	2.3%
$100k–$150k	13.3%
$150k–$200k	11.7%
$200k+	56.7%
Median income	$233,865

Housing

Home values

Under $50k 0.4%

$100k–$150k 2.1%

$200k–$300k 2.0%

$300k–$500k 13.5%

$500k–$1M 59.7%

$1M+ 22.3%

Housing overview

Metric	Value
Median home value	$774,900
Median rent / month	$1,636
Owner occupied	86.9%
Renter occupied	13.1%
Vacant	5.4%
Single-family detached	81.6%
Large apartment buildings	10.4%
Mobile homes	0.0%
Median rooms	7.5
Avg household size (owned)	2.99

Year built

Era	%
2020 or later	0.0%
2010–2019	13.4%
2000–2009	22.2%
1990–1999	21.2%
1980–1989	14.8%
1970–1979	7.4%
1960–1969	6.9%
1950–1959	3.5%
1940–1949	0.0%
1939 or earlier	10.5%

Bedrooms

Size	% of units
No bedroom (studio)	1.4%
1 bedroom	7.4%
2 bedrooms	13.7%
3 bedrooms	28.5%
4 bedrooms	37.7%
5+ bedrooms	11.2%

Vehicles per household

Vehicles	% of households
No vehicle	6.5%
1 vehicle	18.2%
2 vehicles	47.2%
3 or more	28.1%

Heating fuel

Fuel type	%
Utility gas	78.4%
Electricity	6.8%
Propane / LP gas	1.7%
Fuel oil	10.9%
Solar	2.2%

Households & families

Household type	Count	%
Married-couple family	1,822	68.9%
Cohabiting couple	10	0.4%
Male householder, no spouse	196	7.4%
Female householder, no spouse	615	23.3%
Households with children under 18	1,031	39.0%
Households with seniors (65+)	1,090	41.2%
Average household size	2.80

Marital status

Status	Male	Female
Never married	20.9%	22.6%
Married	69.5%	57.8%
Separated	1.8%	0.8%
Widowed	3.8%	13.1%
Divorced	4.1%	5.7%

Education

Less than 9th grade 2.2%

Some HS, no diploma 0.3%

HS graduate 11.5%

Some college, no degree 8.5%

Associate's degree 3.6%

Bachelor's degree 31.5%

Graduate / professional 42.3%

Metric	%
HS diploma or higher	97.5%
Bachelor's or higher	73.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	71	3.6%
Kindergarten	45	2.3%
Elementary school	861	43.8%
High school	715	36.3%
College / grad school	276	14.0%

Employment

Industry of employment

Manufacturing 22.0%

Education & healthcare 21.8%

Finance & real estate 19.2%

Professional & management 14.5%

Retail trade 4.9%

Arts, food & hospitality 4.7%

Information 2.9%

Other services 2.8%

Wholesale trade 2.2%

Construction 2.1%

Public administration 1.6%

Transportation & utilities 1.3%

Occupation

Category	%
Management, business & arts	77.5%
Service	4.8%
Sales & office	14.7%
Natural resources & construction	1.3%
Production & transportation	1.8%

Employment type

Type	%
Private sector	84.8%
Government	8.4%
Self-employed	6.8%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	57.6%
Carpool	4.3%
Public transit	4.1%
Walk	8.2%
Work from home	23.7%
Other means	2.1%
Avg commute (minutes)	36.7

Poverty

All people 3.3%

Under 18 years 2.4%

18 and over 3.5%

Married-couple families 1.0%

Female-led households 9.7%

Income support

Source	% of households
Social Security	31.8%
Retirement income	26.9%
Supplemental Security	0.0%
Cash public assistance	1.1%
Food stamps / SNAP	0.4%

Health indicators

Condition	%
Obesity	23.0%
High blood pressure	0.0%
High cholesterol	0.0%
Diabetes	7.7%
Heart disease	5.8%
Stroke	2.3%
Asthma	7.9%
Arthritis	21.4%
Kidney disease	2.5%
Pulmonary disease	4.1%
Cancer	8.2%

Behavior / access	%
Smoking	7.6%
Binge drinking	15.1%
No physical activity	13.4%
Less than 7 hrs sleep	28.0%
Depression	16.0%
Fair or poor health	7.8%
Poor mental health	10.2%
Poor physical health	6.5%
No health insurance	6.7%
Visited doctor (checkup)	77.0%
Visited dentist	77.0%
Cholesterol screening	0.0%
Teeth loss	5.7%

Veterans & disability

Veterans	Count	%
Civilian veterans	221	3.8%

Disability	%
Any disability	7.9%
Under 18	2.1%
18–64 years	2.3%
65 and over	29.4%

Health insurance coverage

Type	%
Private insurance	88.6%
Public insurance	21.8%
No insurance	1.2%
Uninsured under 19	0.5%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	7,298	97.1%
Spanish	381	5.2%
Other Indo-European	49	0.7%
Asian & Pacific Islander	151	2.1%
Other languages	181	2.5%

Place of birth & citizenship

Origin	Count	%
Native born (US)	6,069	80.8%
Born in same state	6,004	79.9%
Born in different state	3,003	40.0%
Foreign born	65	0.9%
Naturalized citizen	1,446	19.2%
Not a US citizen	941	65.1%

Ancestry

Ancestry	Count	%
Italian	985	13.1%
French	652	8.7%
Irish	162	2.2%
English	127	1.7%

Ancestry	Count	%
Arab	97	1.3%
Polish	69	0.9%
Norwegian	53	0.7%

Technology access

Metric	% of households
Computer access	35.2%
Internet access	91.6%

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

Frequently asked questions about ZIP code 08558

What city is ZIP code 08558 in?

ZIP code 08558 is primarily assigned to Skillman, New Jersey.

What county is ZIP code 08558 in?

ZIP code 08558 falls within Somerset County, New Jersey.

How educated is the population of ZIP code 08558?

74% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Is ZIP code 08558 mostly owner-occupied?

87% of occupied units in ZIP code 08558 are owner-occupied, well above the national average.

What is the median household income in ZIP code 08558?

The median household income in ZIP code 08558 is $233,865, above the national median of ~$75,000.

What is the typical home value in ZIP code 08558?

The median home value in ZIP code 08558 is $774,900.

What timezone is ZIP code 08558 in?

ZIP code 08558 observes the EST timezone.