08831 ZIP Code — Monroe Township, NJ

Middlesex County, New Jersey

ZIP code 08831 is located in Monroe Township, New Jersey, within Middlesex County. It covers approximately 51.30 square miles and serves a population of 54,229 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 732.

About ZIP code 08831

The housing stock consists of a mix of housing types. Most homes were built in the 2000s, giving the area an established character. Median home value is $451,000. Owner-occupancy is high at 90%, well above the national average.

The gap between median ($108,626) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 4% is below the national average. 55% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. An above-average commute of 41 minutes suggests many residents work outside the immediate area. Remote work is prevalent — 21% of workers work from home.

Educational attainment is high — 50% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 08831 reflects a community defined by high homeownership, a high rate of remote workers, and a significant Social Security-dependent population.

54,229

population

51.30

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

08831 ZIP code map

Cities in ZIP code 08831

Below are the cities the US Postal Service accepts for ZIP code 08831. Using any city not on this list may result in mail delivery delays.

City	Status
Monroe Township	Acceptable
Monroe Township	Acceptable
Monroe Township	Preferred

Nearby ZIP codes

08828 Helmetta (3.3 mi) 08884 Spotswood (4.6 mi) 07726 Englishtown (4.7 mi) 08810 Dayton (5.1 mi) 08512 Cranbury (6.1 mi) 08857 Old Bridge (6.3 mi) 08816 East Brunswick (7.3 mi) 08535 Millstone Township (7.4 mi) 08520 Hightstown (7.7 mi) 08852 Monmouth Junction (8.2 mi) 08902 North Brunswick (8.2 mi) 08882 South River (8.2 mi)

Demographics updated 06/2026

Population
Total population	54,229
Population density	1,057 / sq mi
State FIPS	34
County FIPS	023

Geography
Land area	51.30 sq mi
Water area	0.46 sq mi
Latitude	40.3312
Longitude	-74.4170
Timezone	Eastern (ET)
Area code	732

Total population by age

Gender

Race & ethnicity

Economics updated 06/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	27.7%	26.5%	30.2%
$50k – $100k	23.5%	27.5%	26.7%
$100k – $200k	31.8%	31.9%	28.3%
Over $200k	17.0%	14.1%	14.8%

Demographics & statistics

54,229

Population

1,057

People per sq mi

53.7

Median age

$108,626

Median household income

$62,709

Per capita income

$451,000

Median home value

$1,739

Median monthly rent

89.6%

Home ownership

4.0%

Poverty rate

5.8%

Unemployment

21,992

Housing units

49.9%

Bachelor's or higher

Age distribution

Male Female

821

Under 5

890

1,460

5–9

1,581

1,688

10–14

1,828

1,104

15–19

1,197

851

20–24

921

1,369

25–34

1,483

2,997

35–44

3,248

3,246

45–54

3,516

1,647

55–59

1,784

1,820

60–64

1,971

4,434

65–74

4,803

3,132

75–84

3,394

1,461

85+

1,583

← Male

Female →

Age summary

Group	Count	%
Under 18	10,068	18.6%
18 and over	44,161	81.4%
65 and over	18,807	34.7%
Median age	53.7 years

Race & ethnicity

White 68.7%

Asian 21.1%

Two or more races 4%

Hispanic or Latino 2.9%

Black or African American 2.4%

Other race 0.9%

American Indian / Alaska Native 0.2%

Group	Count	%
White	38,349	68.7%
Asian	11,774	21.1%
Two or more races	2,206	4%
Hispanic or Latino	1,606	2.9%
Black or African American	1,319	2.4%
Other race	493	0.9%
American Indian / Alaska Native	88	0.2%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	27.7%	26.5%	30.2%
$50k – $100k	23.5%	27.5%	26.7%
$100k – $200k	31.8%	31.9%	28.3%
Over $200k	17.0%	14.1%	14.8%

Under $10k 2.7%

$10k–$15k 2.4%

$15k–$25k 5.9%

$25k–$35k 3.7%

$35k–$50k 10.0%

$50k–$75k 11.8%

$75k–$100k 11.7%

$100k–$150k 13.7%

$150k–$200k 15.1%

$200k+ 23.0%

Range	% of households
Under $10k	2.7%
$10k–$15k	2.4%
$15k–$25k	5.9%
$25k–$35k	3.7%
$35k–$50k	10.0%
$50k–$75k	11.8%
$75k–$100k	11.7%
$100k–$150k	13.7%
$150k–$200k	15.1%
$200k+	23.0%
Median income	$108,626

Housing

Home values

Under $50k 0.7%

$50k–$100k 2.1%

$100k–$150k 3.5%

$150k–$200k 6.0%

$200k–$300k 14.0%

$300k–$500k 30.8%

$500k–$1M 39.9%

$1M+ 3.0%

Housing overview

Metric	Value
Median home value	$451,000
Median rent / month	$1,739
Owner occupied	89.6%
Renter occupied	10.4%
Vacant	5.0%
Single-family detached	61.6%
Large apartment buildings	3.8%
Mobile homes	0.1%
Median rooms	6.1
Avg household size (owned)	2.37

Year built

Era	%
2020 or later	0.3%
2010–2019	15.6%
2000–2009	20.9%
1990–1999	15.4%
1980–1989	14.8%
1970–1979	14.6%
1960–1969	8.5%
1950–1959	4.5%
1940–1949	2.2%
1939 or earlier	3.2%

Bedrooms

Size	% of units
No bedroom (studio)	2.4%
1 bedroom	3.7%
2 bedrooms	42.0%
3 bedrooms	23.9%
4 bedrooms	20.5%
5+ bedrooms	7.5%

Vehicles per household

Vehicles	% of households
No vehicle	6.9%
1 vehicle	37.1%
2 vehicles	39.3%
3 or more	16.7%

Heating fuel

Fuel type	%
Utility gas	65.3%
Electricity	28.8%
Propane / LP gas	1.6%
Fuel oil	3.5%
Wood	0.1%
Solar	0.3%
No fuel used	0.3%

Households & families

Household type	Count	%
Married-couple family	13,931	60.1%
Cohabiting couple	574	2.5%
Male householder, no spouse	2,424	10.5%
Female householder, no spouse	6,264	27.0%
Households with children under 18	5,765	24.9%
Households with seniors (65+)	12,982	56.0%
Average household size	2.32

Marital status

Status	Male	Female
Never married	20.0%	15.2%
Married	68.2%	57.3%
Separated	0.6%	0.6%
Widowed	4.7%	19.0%
Divorced	6.6%	7.8%

Education

Less than 9th grade 2.2%

Some HS, no diploma 2.9%

HS graduate 24.7%

Some college, no degree 15.0%

Associate's degree 5.4%

Bachelor's degree 29.8%

Graduate / professional 20.0%

Metric	%
HS diploma or higher	95.0%
Bachelor's or higher	49.9%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	564	5.3%
Kindergarten	430	4.0%
Elementary school	5,450	51.1%
High school	2,194	20.6%
College / grad school	2,021	19.0%

Employment

Industry of employment

Education & healthcare 22.1%

Professional & management 17.2%

Finance & real estate 14.3%

Retail trade 9.8%

Manufacturing 7.5%

Transportation & utilities 5.8%

Public administration 5.3%

Construction 4.7%

Arts, food & hospitality 4.5%

Wholesale trade 3.5%

Other services 3.0%

Information 2.1%

Agriculture & mining 0.2%

Occupation

Category	%
Management, business & arts	57.4%
Service	10.2%
Sales & office	19.9%
Natural resources & construction	5.2%
Production & transportation	7.3%

Employment type

Type	%
Private sector	82.1%
Government	14.9%
Self-employed	2.9%
Unpaid family workers	0.1%

Commute

Method	%
Drive alone	66.4%
Carpool	3.9%
Public transit	6.2%
Walk	1.1%
Work from home	21.1%
Other means	1.2%
Avg commute (minutes)	40.6

Poverty

All people 4.0%

Under 18 years 1.1%

18 and over 4.6%

Married-couple families 2.6%

Female-led households 5.0%

Income support

Source	% of households
Social Security	54.9%
Retirement income	41.2%
Supplemental Security	3.2%
Cash public assistance	1.6%
Food stamps / SNAP	2.8%

Health indicators

Condition	%
Obesity	22.0%
High blood pressure	0.0%
High cholesterol	0.0%
Diabetes	10.6%
Heart disease	8.7%
Stroke	3.5%
Asthma	8.3%
Arthritis	25.3%
Kidney disease	3.3%
Pulmonary disease	6.4%
Cancer	9.8%

Behavior / access	%
Smoking	9.6%
Binge drinking	13.8%
No physical activity	19.8%
Less than 7 hrs sleep	29.7%
Depression	14.1%
Fair or poor health	11.3%
Poor mental health	11.0%
Poor physical health	8.7%
No health insurance	10.8%
Visited doctor (checkup)	80.0%
Visited dentist	72.0%
Cholesterol screening	0.0%
Teeth loss	10.1%

Veterans & disability

Veterans	Count	%
Civilian veterans	2,762	6.3%

Disability	%
Any disability	12.7%
Under 18	4.0%
18–64 years	5.7%
65 and over	26.9%

Health insurance coverage

Type	%
Private insurance	82.6%
Public insurance	40.5%
No insurance	1.7%
Uninsured under 19	0.6%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	52,518	96.8%
Spanish	4,477	8.5%
Other Indo-European	870	1.7%
Asian & Pacific Islander	1,684	3.2%
Other languages	1,429	2.7%

Place of birth & citizenship

Origin	Count	%
Native born (US)	41,773	77.0%
Born in same state	41,311	76.2%
Born in different state	23,555	43.4%
Foreign born	462	0.9%
Naturalized citizen	12,456	23.0%
Not a US citizen	8,686	69.7%

Ancestry

Ancestry	Count	%
Italian	5,976	11%
Arab	1,611	3%
French	1,550	2.9%
Irish	1,015	1.9%
English	227	0.4%

Ancestry	Count	%
Polish	212	0.4%
Norwegian	196	0.4%
German	83	0.2%
Dutch	61	0.1%

Technology access

Metric	% of households
Computer access	42.8%
Internet access	93.8%

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

Frequently asked questions about ZIP code 08831

What part of Monroe Township is ZIP code 08831?

ZIP code 08831 covers a portion of Monroe Township, New Jersey, within Middlesex County.

What county is ZIP code 08831 in?

ZIP code 08831 falls within Middlesex County, New Jersey.

Does ZIP code 08831 have an older population?

35% of residents in ZIP code 08831 are 65 or older, above the national average of ~17%.

Does ZIP code 08831 have a large retiree population?

55% of households in ZIP code 08831 receive Social Security income, suggesting a significant retiree or disability population.

Is ZIP code 08831 mostly owner-occupied?

90% of occupied units in ZIP code 08831 are owner-occupied, well above the national average.

How educated is the population of ZIP code 08831?

50% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

What timezone is ZIP code 08831 in?

ZIP code 08831 observes the EST timezone.