Mercer County, NJ ZIP Codes

New Jersey (NJ)  ·  38 ZIP codes  ·  10 cities
38
ZIP codes
385,898
population (2021)
+5.3%
pop change since 2010
34021
FIPS code
Mercer County ZIP code map
About Mercer County
Mercer County is located in New Jersey and contains 38 ZIP codes across 10 cities and communities. The county's population was 385,898 as of 2021, an increase of 5.3% from 366,513 in 2010. The timezone is Central Time (observes DST). The Federal Information Processing System (FIPS) code for Mercer County is 34021.
Population
2021 population385,898
2010 population366,513
Change+5.3%
County details
StateNew Jersey
FIPS code34021
TimezoneCentral
Daylight savingYes
Cities in Mercer County
Hightstown Hopewell Lawrence Township Pennington Princeton Princeton Junction Robbinsville Titusville Trenton Windsor
ZIP codes for Mercer County, NJ (38)
ZIP code City County Map
08520 Hightstown Mercer View map
08525 Hopewell Mercer View map
08534 Pennington Mercer View map
08540 Princeton Mercer View map
08541 Princeton Mercer View map
08542 Princeton Mercer View map
08543 Princeton Mercer View map
08544 Princeton Mercer View map
08550 Princeton Junction Mercer View map
08560 Titusville Mercer View map
08561 Windsor Mercer View map
08601 Trenton Mercer View map
08602 Trenton Mercer View map
08603 Trenton Mercer View map
08604 Trenton Mercer View map
08605 Trenton Mercer View map
08606 Trenton Mercer View map
08607 Trenton Mercer View map
08608 Trenton Mercer View map
08609 Trenton Mercer View map
08610 Trenton Mercer View map
08611 Trenton Mercer View map
08618 Trenton Mercer View map
08619 Trenton Mercer View map
08620 Trenton Mercer View map
08625 Trenton Mercer View map
08628 Trenton Mercer View map
08629 Trenton Mercer View map
08638 Trenton Mercer View map
08645 Trenton Mercer View map
08646 Trenton Mercer View map
08647 Trenton Mercer View map
08648 Lawrence Township Mercer View map
08650 Trenton Mercer View map
08666 Trenton Mercer View map
08690 Trenton Mercer View map
08691 Robbinsville Mercer View map
08695 Trenton Mercer View map

Demographics & statistics

390,072
Population
39.8
Median age
$105,727
Median household income
$51,359
Per capita income
$350,680
Median home value
$1,663
Median monthly rent
64.1%
Home ownership
10.4%
Poverty rate
6.3%
Unemployment
102,201
Housing units
45.2%
Bachelor's or higher

Age distribution

Male Female
10,741
Under 5
10,744
11,410
5–9
11,414
12,453
10–14
12,457
13,361
15–19
13,366
13,313
20–24
13,317
23,999
25–34
24,007
25,262
35–44
25,270
27,453
45–54
27,463
13,198
55–59
13,203
13,121
60–64
13,125
17,580
65–74
17,586
9,062
75–84
9,065
4,050
85+
4,052
← Male
Female →

Age summary

GroupCount%
Under 1884,29720.4%
18 and over305,77579.6%
65 and over61,39516.4%
Median age39.8 years

Race & ethnicity

White 48%
Black or African American 17.4%
Asian 11.7%
Hispanic or Latino 10.3%
Other race 6.3%
Two or more races 6%
American Indian / Alaska Native 0.2%
GroupCount%
White208,82048%
Black or African American75,63817.4%
Asian51,00311.7%
Hispanic or Latino44,87310.3%
Other race27,2456.3%
Two or more races26,3036%
American Indian / Alaska Native9640.2%

Household income

Under $10k 5.2%
$10k–$15k 4.2%
$15k–$25k 5.4%
$25k–$35k 5.2%
$35k–$50k 7.3%
$50k–$75k 11.7%
$75k–$100k 12.1%
$100k–$150k 17.7%
$150k–$200k 11.5%
$200k+ 19.8%
Range% of households
Under $10k5.2%
$10k–$15k4.2%
$15k–$25k5.4%
$25k–$35k5.2%
$35k–$50k7.3%
$50k–$75k11.7%
$75k–$100k12.1%
$100k–$150k17.7%
$150k–$200k11.5%
$200k+19.8%
Median income$105,727

Housing

Home values

Under $50k 2.8%
$50k–$100k 10.1%
$100k–$150k 8.6%
$150k–$200k 7.7%
$200k–$300k 18.2%
$300k–$500k 27.4%
$500k–$1M 21.3%
$1M+ 4.0%

Housing overview

MetricValue
Median home value$350,680
Median rent / month$1,663
Owner occupied64.1%
Renter occupied35.9%
Vacant7.4%
Single-family detached49.9%
Large apartment buildings10.3%
Mobile homes0.4%
Median rooms6.0
Avg household size (owned)2.67

Year built

Era%
2020 or later0.2%
2010–20194.3%
2000–20097.8%
1990–19998.4%
1980–198911.6%
1970–197911.9%
1960–196911.6%
1950–195914.8%
1940–19495.9%
1939 or earlier23.5%

Bedrooms

Size% of units
No bedroom (studio)3.4%
1 bedroom13.8%
2 bedrooms24.2%
3 bedrooms32.6%
4 bedrooms20.6%
5+ bedrooms5.3%

Vehicles per household

Vehicles% of households
No vehicle12.5%
1 vehicle32.9%
2 vehicles36.1%
3 or more18.5%

Heating fuel

Fuel type%
Utility gas70.5%
Electricity16.4%
Propane / LP gas2.3%
Fuel oil9.3%
Wood0.4%
Solar0.1%
No fuel used0.4%

Households & families

Household typeCount%
Married-couple family69,04647.4%
Cohabiting couple6,8714.8%
Male householder, no spouse24,22818.3%
Female householder, no spouse43,14129.6%
Households with children under 1844,47728.8%
Households with seniors (65+)44,42431.3%
Average household size2.55

Marital status

StatusMaleFemale
Never married39.7%33.7%
Married48.8%45.3%
Separated2.5%1.8%
Widowed1.6%9.2%
Divorced7.4%9.9%

Education

Less than 9th grade 4.4%
Some HS, no diploma 5.6%
HS graduate 24.3%
Some college, no degree 15.0%
Associate's degree 5.5%
Bachelor's degree 24.2%
Graduate / professional 21.0%
Metric%
HS diploma or higher90.0%
Bachelor's or higher45.2%

School enrollment (ages 3–17)

TypeCount%
Nursery / preschool6,1647.5%
Kindergarten4,8525.1%
Elementary school37,41437.7%
High school20,87221.9%
College / grad school30,78427.9%

Employment

Industry of employment

Education & healthcare 27.7%
Professional & management 14.6%
Finance & real estate 9.0%
Retail trade 8.4%
Manufacturing 7.0%
Arts, food & hospitality 6.8%
Public administration 6.4%
Transportation & utilities 5.8%
Construction 5.2%
Other services 3.9%
Wholesale trade 3.2%
Information 1.8%
Agriculture & mining 0.3%

Occupation

Category%
Management, business & arts48.2%
Service15.5%
Sales & office18.5%
Natural resources & construction6.2%
Production & transportation11.6%

Employment type

Type%
Private sector79.8%
Government16.0%
Self-employed4.1%
Unpaid family workers0.1%

Commute

Method%
Drive alone64.6%
Carpool9.0%
Public transit4.5%
Walk4.2%
Other means2.2%
Avg commute (minutes)28.3

Poverty

All people 10.4%
Under 18 years 10.0%
18 and over 10.4%
Married-couple families 3.4%
Female-led households 15.1%

Income support

Source% of households
Social Security30.9%
Retirement income25.2%
Supplemental Security4.4%
Cash public assistance2.7%
Food stamps / SNAP8.3%

Health indicators

Condition%
High blood pressure0.0%
High cholesterol0.0%
Heart disease5.3%
Stroke2.7%
Asthma9.7%
Arthritis20.3%
Kidney disease2.6%
Pulmonary disease5.2%
Cancer5.8%
Behavior / access%
Binge drinking15.9%
No physical activity20.5%
Less than 7 hrs sleep34.2%
Fair or poor health12.3%
Poor mental health14.0%
Poor physical health8.4%
No health insurance14.9%
Visited doctor (checkup)75.4%
Visited dentist64.9%
Cholesterol screening0.0%
Teeth loss12.5%

Veterans & disability

VeteransCount%
Civilian veterans11,5443.9%
Disability%
Any disability11.2%
Under 184.3%
18–64 years9.2%
65 and over28.9%

Health insurance coverage

Type%
Private insurance76.0%
Public insurance31.1%
Uninsured under 193.3%

Language & origin

Language spoken at home (age 5+)

LanguageCount%
English only368,58794.6%
Spanish48,65311.4%
Other Indo-European28,1997.0%
Asian & Pacific Islander11,5032.5%
Other languages7,4371.6%

Place of birth & citizenship

OriginCount%
Native born (US)292,50077.5%
Born in same state280,64074.3%
Born in different state196,16151.3%
Foreign born11,8603.2%
Naturalized citizen97,57222.5%
Not a US citizen49,45454.6%

Ancestry

AncestryCount%
Italian39,84310.2%
French22,4915.8%
Arab10,0712.6%
Irish5,2771.4%
English2,7470.7%
AncestryCount%
Polish1,4380.4%
Norwegian1,4090.4%
Dutch8990.2%
German6520.2%

Technology access

Metric% of households
Computer access38.7%
Internet access93.7%

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

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