Princeton Junction ZIP Code List — Mercer County, NJ

There is one unique ZIP code in Princeton Junction, New Jersey and it is 08550. Area code: 609.

ZIP codes

19.13

sq mi land

0.59

sq mi water

609

area code

Princeton Junction, NJ ZIP code map

About Princeton Junction, NJ

Princeton Junction is a charming community located in Mercer County, New Jersey. This small yet vibrant area is part of West Windsor Township and boasts a unique blend of suburban tranquility and proximity to the bustling Princeton area. With its historical roots and modern developments, Princeton Junction is an appealing destination for families and professionals alike.

Location & geography

Geographically, Princeton Junction is situated in the central part of New Jersey, making it easily accessible to several major metropolises. It lies approximately 3 miles southwest of the historic town of Princeton and is about 15 miles north of Trenton, the state capital. The total area of Princeton Junction covers 19.13 square miles of land and includes a water area of 0.59 square miles.

Community & economy

The character of Princeton Junction is defined by its friendly and diverse community, which includes families, students, and professionals. The local economy is supported by various industries such as education, healthcare, and technology, with nearby Princeton University serving as a significant contributor to the area's vibrancy. Daily life here consists of a blend of local events, outdoor activities, and easy access to cultural hubs in Princeton and surrounding areas.

Transportation

Princeton Junction is well-connected through major highways, including Route 1 and the New Jersey Turnpike, facilitating easy commutes. The area is served by the NJ Transit train station, providing efficient rail service to New York City and Philadelphia. The nearest major airport is Trenton-Mercer Airport, located about 10 miles away.

History

Princeton Junction was founded in the 19th century, emerging as a key transportation hub with the advent of the railroad. Throughout its history, the town has witnessed growth driven largely by its proximity to Princeton University and its appeal as a residential area for those working in nearby cities. Notable events in its history include the development of the rail infrastructure that helped shape the community's growth.

Did you know?

One surprising fact about Princeton Junction is that it is home to the West Windsor-Plainsboro High School South, which has been consistently ranked among the top public high schools in New Jersey. Additionally, the area is known for its scenic parks and recreation facilities, which offer numerous outdoor activities for residents and visitors alike.

ZIP codes for Princeton Junction, NJ (1)

ZIP code	City	County	Map
08550	Princeton Junction	Mercer	View map

Demographics & statistics

20,954

Population

45.3

Median age

$196,053

Median household income

$92,716

Per capita income

$714,400

Median home value

$2,688

Median monthly rent

76.9%

Home ownership

2.0%

Poverty rate

4.7%

Unemployment

6,111

Housing units

82.4%

Bachelor's or higher

Age distribution

Male Female

444

Under 5

426

612

5–9

587

1,006

10–14

964

650

15–19

623

366

20–24

350

650

25–34

622

1,510

35–44

1,447

2,006

45–54

1,922

940

55–59

900

833

60–64

798

1,025

65–74

982

470

75–84

450

189

85+

182

← Male

Female →

Age summary

Group	Count	%
Under 18	4,904	23.4%
18 and over	16,050	76.6%
65 and over	3,298	15.7%
Median age	45.3 years

Race & ethnicity

Asian 49.5%

White 37.5%

Two or more races 5%

Hispanic or Latino 3.5%

Black or African American 3%

American Indian / Alaska Native 0.8%

Other race 0.7%

Group	Count	%
Asian	10,749	49.5%
White	8,145	37.5%
Two or more races	1,086	5%
Hispanic or Latino	761	3.5%
Black or African American	643	3%
American Indian / Alaska Native	183	0.8%
Other race	148	0.7%

Household income

Under $10k 1.9%

$10k–$15k 1.8%

$15k–$25k 0.7%

$25k–$35k 1.4%

$35k–$50k 4.3%

$50k–$75k 6.5%

$75k–$100k 4.6%

$100k–$150k 11.0%

$150k–$200k 18.1%

$200k+ 49.6%

Range	% of households
Under $10k	1.9%
$10k–$15k	1.8%
$15k–$25k	0.7%
$25k–$35k	1.4%
$35k–$50k	4.3%
$50k–$75k	6.5%
$75k–$100k	4.6%
$100k–$150k	11.0%
$150k–$200k	18.1%
$200k+	49.6%
Median income	$196,053

Housing

Home values

Under $50k 0.2%

$50k–$100k 0.3%

$100k–$150k 0.4%

$150k–$200k 0.7%

$200k–$300k 1.4%

$300k–$500k 14.2%

$500k–$1M 72.6%

$1M+ 10.1%

Housing overview

Metric	Value
Median home value	$714,400
Median rent / month	$2,688
Owner occupied	76.9%
Renter occupied	23.1%
Vacant	2.8%
Single-family detached	71.9%
Large apartment buildings	4.8%
Mobile homes	0.0%
Median rooms	7.6
Avg household size (owned)	2.81

Year built

Era	%
2020 or later	0.0%
2010–2019	6.7%
2000–2009	16.2%
1990–1999	19.3%
1980–1989	28.4%
1970–1979	12.0%
1960–1969	5.9%
1950–1959	6.0%
1940–1949	1.3%
1939 or earlier	4.3%

Bedrooms

Size	% of units
No bedroom (studio)	0.2%
1 bedroom	7.2%
2 bedrooms	22.3%
3 bedrooms	18.2%
4 bedrooms	36.9%
5+ bedrooms	15.1%

Vehicles per household

Vehicles	% of households
No vehicle	5.1%
1 vehicle	26.9%
2 vehicles	49.3%
3 or more	18.7%

Heating fuel

Fuel type	%
Utility gas	77.6%
Electricity	17.8%
Propane / LP gas	0.3%
Fuel oil	4.2%

Households & families

Household type	Count	%
Married-couple family	5,510	72.0%
Cohabiting couple	66	0.9%
Male householder, no spouse	548	7.2%
Female householder, no spouse	1,534	20.0%
Households with children under 18	2,961	38.7%
Households with seniors (65+)	2,305	30.1%
Average household size	2.74

Marital status

Status	Male	Female
Never married	24.1%	20.9%
Married	68.3%	66.5%
Separated	0.5%	0.0%
Widowed	1.6%	6.9%
Divorced	5.4%	5.7%

Education

Less than 9th grade 0.6%

Some HS, no diploma 0.7%

HS graduate 6.7%

Some college, no degree 6.7%

Associate's degree 2.9%

Bachelor's degree 31.7%

Graduate / professional 50.7%

Metric	%
HS diploma or higher	98.7%
Bachelor's or higher	82.4%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	355	6.3%
Kindergarten	382	6.8%
Elementary school	2,499	44.2%
High school	1,203	21.3%
College / grad school	1,210	21.4%

Employment

Industry of employment

Professional & management 26.9%

Finance & real estate 21.1%

Education & healthcare 21.1%

Manufacturing 7.0%

Retail trade 6.0%

Information 4.8%

Arts, food & hospitality 4.2%

Wholesale trade 2.9%

Public administration 2.8%

Transportation & utilities 1.5%

Other services 1.1%

Construction 0.6%

Occupation

Category	%
Management, business & arts	79.2%
Service	4.0%
Sales & office	13.6%
Natural resources & construction	0.2%
Production & transportation	2.9%

Employment type

Type	%
Private sector	86.4%
Government	8.7%
Self-employed	4.8%
Unpaid family workers	0.1%

Commute

Method	%
Drive alone	42.3%
Carpool	3.6%
Public transit	14.2%
Walk	1.3%
Other means	1.5%
Avg commute (minutes)	45.6

Poverty

All people 2.0%

Under 18 years 0.0%

18 and over 2.6%

Married-couple families 1.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	24.8%
Retirement income	20.4%
Supplemental Security	1.6%
Cash public assistance	1.5%
Food stamps / SNAP	2.4%

Health indicators

Condition	%
High blood pressure	0.0%
High cholesterol	0.0%
Heart disease	4.2%
Stroke	1.8%
Asthma	7.3%
Arthritis	17.7%
Kidney disease	2.0%
Pulmonary disease	2.9%
Cancer	6.3%

Behavior / access	%
Binge drinking	13.5%
No physical activity	13.2%
Less than 7 hrs sleep	29.0%
Fair or poor health	6.0%
Poor mental health	9.3%
Poor physical health	5.1%
No health insurance	6.7%
Visited doctor (checkup)	76.6%
Visited dentist	78.1%
Cholesterol screening	0.0%
Teeth loss	4.2%

Veterans & disability

Veterans	Count	%
Civilian veterans	282	1.8%

Disability	%
Any disability	4.9%
Under 18	0.3%
18–64 years	2.8%
65 and over	19.5%

Health insurance coverage

Type	%
Private insurance	89.6%
Public insurance	17.3%
Uninsured under 19	2.3%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	20,084	95.8%
Spanish	2,217	11.0%
Other Indo-European	290	1.4%
Asian & Pacific Islander	635	3.2%
Other languages	1,222	6.1%

Place of birth & citizenship

Origin	Count	%
Native born (US)	12,045	57.5%
Born in same state	11,674	55.7%
Born in different state	5,954	28.4%
Foreign born	371	1.8%
Naturalized citizen	8,909	42.5%
Not a US citizen	6,047	67.9%

Ancestry

Ancestry	Count	%
Italian	1,741	8.3%
French	917	4.4%
Arab	541	2.6%
Irish	184	0.9%
Polish	70	0.3%

Ancestry	Count	%
English	69	0.3%
Norwegian	63	0.3%
German	35	0.2%
Dutch	16	0.1%

Technology access

Metric	% of households
Computer access	36.5%
Internet access	99.6%

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

Frequently asked questions

What is the ZIP code for Princeton Junction, NJ?

Princeton Junction, NJ has one ZIP code: 08550.

What is the main ZIP code for Princeton Junction, NJ?

The primary ZIP code for Princeton Junction, NJ is 08550. The city uses area code 609 for phone service.

What county is Princeton Junction, NJ in?

Princeton Junction is located in Mercer County, New Jersey.

How many ZIP codes are in Princeton Junction, NJ?

Princeton Junction, NJ has 1 ZIP code.

What is the ZIP code for the Princeton Junction train station area in Mercer County?

The Princeton Junction train station and surrounding areas are located in ZIP code 08550, which serves this important transportation hub in Mercer County, New Jersey.

What ZIP code should I use for mail addressed to businesses near Princeton University's Princeton Junction campus facilities?

Mail to Princeton Junction area addresses, including those near Princeton University's satellite facilities, should use ZIP code 08550.