Stillwater Township, NJ

Township in Sussex County, NJ, US

By Neilsberg Research

Last updated May 1, 2026

Key Indicators

A quick look at key numbers

Population

4,052

Source: U.S. Census Bureau American Community Survey (ACS) 2020-2024 5-Year Estimates

Median Age

51.5

years ∙ half population younger than 51.5, half older

Diversity Index

22.5%

chance two random people differ in race and ethnicity

Nativity

6.5%

foreign-born population

93.5%Native

6.5% Foreign-born

Geographic Context

Location, size, and surroundings

About

Stillwater Township is a township in Sussex County, New Jersey, United States.

Location

Township in Sussex County, NJ, US

Co-ordinates

DEC41.074125° N, 74.868878° W

DMS41° 04′ 26.85″ N, 74° 52′ 07.96″ W

Population Density & area

150.6/sq mi (58.13/km²)

Total Area

28.2 sq mi (73.1 km²)

Land Area

26.9 sq mi (69.7 km²) · 95.3%

Water Area

1.3 sq mi (3.4 km²) · 4.7%

Demographics & Living

Who lives here, how households are formed, and community composition

Population Composition

Key characteristics of the population

Sex Distribution

54.3% male

Male 54.3%

Female 45.7%

males per 100 females

Stillwater Township 118.9

Sussex County 101.6

New Jersey 96.9

Nativity

6.5%

foreign-born population

93.5%Native

6.5% Foreign-born

% Foreign-born

Stillwater Township 6.5%

Sussex County 8.7%

New Jersey 23.9%

Age Distribution

How the population is spread across age groups

Median Age

51.5

years ∙ half population younger than 51.5, half older

Stillwater Township

51.5

Sussex County

43.8

New Jersey

40.1

Dependency ratio

71.9

dependents per 100 working-age adults

Stillwater Township 71.9

Sussex County 62.5

New Jersey 63.9

AGE DISTRIBUTION

Distribution of age group

Median age

	Stillwater Township	Sussex County	New Jersey
Age Group
Children (Under 18)	15.5%	19.5%	21.8%
Working age (18-64)	58.2%	61.5%	61%
Senior (65+)	26.3%	19%	17.2%
Dependency ratio
Total dependency ratio	71.9	62.5	63.9
Child dependency ratio	26.6	31.7	35.7
Old-age dependency ratio	45.3	30.8	28.2

Racial & Ethnic Composition

Racial and ethnic makeup and how it compares

Race & Ethnicity

White

87.8%

Black

Asian

2.8%

Hispanic

4.7%

Other

4.7%

Note: White, Black, and Asian refer to individuals belonging to a single race and not of Hispanic origin. Hispanics may be of any race.

Diversity Index

22.5%

chance two random people differ in race and ethnicity

Stillwater Township 22.5%

Sussex County 34.8%

New Jersey 66.4%

Note: The Diversity Index (DI), based on the Blau Index, measures the probability that two randomly selected individuals differ in race and ethnicity. Values range from 0 (no diversity) to 1 (high diversity) and are shown as percentages.

RACIAL & ETHNIC COMPOSITION

Race & Ethnicity

Percentage of Stillwater Township population

	Stillwater Township	Sussex County	New Jersey
Hispanic or Latino	4.7%	11.9%	22.5%
Mexican	0%	0.6%	2.6%
Puerto Rican	0.4%	4%	5.1%
Cuban	0%	0.8%	1%
Other Hispanic / Latino	4.2%	6.5%	13.8%
Not Hispanic or Latino	95.3%	88.1%	77.5%
One race	93.4%	84.1%	74%
White	87.8%	79.7%	50.9%
Black or African American	0%	1.7%	12.2%
American Indian and Alaska Native	0.1%	0.1%	0.1%
Asian	2.8%	2%	10%
Native Hawaiian and Other Pacific Islander	0%	0%	0%
Some Other Race	2.6%	0.6%	0.8%
Two or more races (Multiracial)	1.9%	4%	3.5%

Household & Families Composition

Household size, type, and family structure

Household structure

76.7% family

Family 76.7%

Non family 23.3%

% family households

Stillwater Township 76.7%

Sussex County 69.3%

New Jersey 67.8%

Average household size

2.52

persons per household

Stillwater Township

2.52

Sussex County

2.5

New Jersey

2.62

Household & Family COMPOSITION

Households

Percentage of Stillwater Township population

	Stillwater Township	Sussex County	New Jersey
Total households	1,611	57,767	3,507,701
Average houshold size	2.52	2.5	2.62
Family households	1,236	40,053	2,377,513
Average family size	2.78	2.98	3.19
Married couple family	995	31,757	1,746,187
Other families	241	8,296	631,326
Male householder	141	2,687	178,050
Female householder	100	5,609	453,276
Non-family households	375	17,714	1,130,188
One-person households	304	13,589	927,585
Male householder	193	6,530	394,706
Senior (65+) living alone	150	2,252	130,069
Female householder	111	7,059	532,879
Senior (65+) living alone	56	3,863	290,265
Other living arrangements	71	4,125	202,603

Housing Profile

Housing stock, ownership, rentals, and cost burdens

Total housing units

1,891

housing units

Stillwater Township 1,891

Sussex County 62,865

New Jersey 3,791,354

Occupancy status

85.2% occupied

Occupied 85.2%

Vacant 14.8%

vacancy rate

Stillwater Township 14.8%

Sussex County 8.1%

New Jersey 7.5%

Housing Characteristics

How the housing supply is structured and used

Types of Housing unit

95.2%

Single family houses

95.2%

Apartments in multi-unit structures

3.1%

Mobile homes

1.6%

Boat, RV, van, etc

Median Year Built

1964

Half of houses were built before 1964, and half after.

Historic ∙ 1939 or earlier

19.2%

Postwar & mid-century ∙ 1940 - 1969

46.6%

Late 20th century ∙ 1970 - 1999

27.2%

Modern ∙ 2000 or later

Note: Median year built reflects occupied units only; distribution includes all units.

Housing Characteristics

Units, rooms & bedrooms

Physical characteristics of housing units

	Stillwater Township	Sussex County	New Jersey
Rooms per unit
Median rooms	5.6	6.4	5.7
1–3 rooms	6.8%	9.3%	16.4%
4–6 rooms	59.2%	43%	46.2%
7+ rooms	33.9%	47.8%	37.4%
Bedrooms
No bedroom / studio	2.2%	2%	3.1%
1 bedroom	7.2%	9%	14.1%
2 bedrooms	34.2%	22.6%	25.6%
3 bedrooms	41.5%	40.4%	31.5%
4+ bedrooms	14.9%	26.1%	25.6%
At a glance
Median year built	1964	1974	1970
Total housing units	1,891	62,865	3,791,354

Occupancy Profile

Who is inside and how they use it

Homeownership

90.1% owners

Renter-occupied 9.9%

Owner-occupied 90.1%

homeownership rate

Stillwater Township 90.1%

Sussex County 83.7%

New Jersey 63.8%

Average household size

2.58

Owner-occupied

1.95

Renter-occupied

owner-occupied average size

Stillwater Township 2.58

Sussex County 2.59

New Jersey 2.75

Housing Characteristics

Occupied unit characteristics

Tenure, crowding, and utilities

	Stillwater Township	Sussex County	New Jersey
Total occupied units	1,611	57,767	3,507,701
Year moved in
2020 or later	17.5%	19.5%	21.2%
2010 to 2019	30.3%	33.6%	39%
2000 to 2009	19.2%	19%	18%
1999 or earlier	33.1%	27.9%	21.8%
Occupants per room
1.00 or fewer	95.8%	98.7%	96%
1.01 to 1.50	1.6%	0.7%	2.5%
1.51 or more	2.6%	0.6%	1.5%
Vehicles availability
No vehicles	0.6%	3.3%	11.1%
1 vehicle	23.3%	26.7%	35.1%
2 vehicles	46.1%	41.6%	35.5%
3 or more vehicles	30%	28.4%	18.3%
House heating fuel used
Gas	18.6%	30.9%	75.5%
Electricity	18.4%	15.3%	16.2%
Solar	0%	0.2%	0.2%
Fuel oil, kerosene etc	53.1%	48.4%	6.4%
All other fuels	10%	4.9%	0.8%
No fuel used	0%	0.2%	0.8%
Selected characteristics
Lacking complete plumbing	0.6%	0.4%	0.3%
Lacking complete kitchen	0.6%	0.5%	0.8%
No telephone service available	0%	0.7%	0.8%

Housing Value

What owner-occupied units are worth

Median home value

$343,100

owner-occupied units

Median value(USD)

Stillwater Township

$343,100

Sussex County

$369,400

New Jersey

$454,400

Housing Cost Burden

35.8%

of homeowners with a mortgage are cost-burdened

% Cost-Burdened Households

Owners with a mortgage

35.8%

Owners without a mortgage

7.3%

Renters

40.3%

Note: Households spending 30% or more of their income on housing costs are considered cost-burdened.

Financial characteristics

Property value and housing costs

Tenure, crowding, and utilities

	Stillwater Township	Sussex County	New Jersey
Property value
Median Value	$343,100	$369,400	$454,400
Under $100,000	6.7%	3.8%	4.3%
$100,000 - $200,000	9%	6.6%	6.5%
$200,000 - $300,000	24.7%	20.4%	12.9%
$300,000 - $500,000	47.2%	48.8%	34.2%
$500,000 - $1,000,000	12.3%	18.8%	34.5%
$1,000,000 and more	0.3%	1.7%	7.6%
Owner-occupied households
With a mortgage	82%	68.4%	63.9%
Without a mortgage	18%	31.6%	36.1%
Median monthly owner costs
With a mortgage	$2,229	$2,473	$2,829
Without a mortgage	$1,063	$1,110	$1,232
Gross rent
Median rent	$1,238	$1,585	$1,720

Education Profile

How educated is the community and how education pays off

Adults with a college degree

32.6%

of adults 25+ with a bachelor's degree or higher

Stillwater Township 32.6%

Sussex County 40.3%

New Jersey 43.6%

Adults without a high school diploma

2.8%

of adults (25+) without a high school diploma

Stillwater Township 2.8%

Sussex County 4.5%

New Jersey 9.3%

School Enrollment

Who is enrolled in school and at what level

School enrollment

817

population (age 3+) enrolled in school

Nursery / Preschool

10.9%

K–12

55.8%

College / Undergraduate

29.6%

Graduate / Professional

3.7%

College-going rate (18-24 yr olds)

18.8%

of 18-24-year-olds in college or graduate school

Stillwater Township

18.8%

Sussex County

37%

New Jersey

46.1%

Enrollment & school type

Enrollment levels, college-going rate, and public vs private school split

Population 3+ currently enrolled in a school

	Stillwater Township	Sussex County	New Jersey
Total enrolled (age 3+)	817	30,550	2,272,695
Nursery / preschool	10.9%	6.9%	7.1%
K–12	55.8%	69.4%	66.6%
Kindergarten	7.2%	5.2%	5.2%
Elementary: Grades 1–4	28.2%	19.1%	19%
Elementary: Grades 5–8	10.5%	20.3%	20.8%
High School: Grades 9–12	9.9%	24.8%	21.6%
College or graduate school	33.3%	23.7%	26.3%
College, undergraduate	29.6%	18.4%	20%
Graduate, professional school	3.7%	5.3%	6.4%
College-going rate · 18-24 yr olds	18.8%	37%	46.1%
School type
Public school	86.5%	82.1%	78.9%
Private school	13.5%	17.9%	21.1%

Education Attainment by Level & Gender

What is the highest level of education completed among adults

Education attainment

3,227

population 25 years and over

Total adults (25+)

Less than 9th grade

0.2%

9th-12th, no diploma

2.6%

HS graduate

32.1%

Some college no degree

22.1%

Associates degree

10.4%

Bachelors degree

21.3%

Graduate or professional degree

11.3%

Attainment by gender

Male vs Female

Adults (25+) · Share within each education level

% male · % female

Less than 9th grade

0% · 100%

9th-12th, no diploma

75% · 25%

HS graduate

61.9% · 38.1%

Some college no degree

73.2% · 26.8%

Associates degree

35% · 65%

Bachelors degree

39.7% · 60.3%

Graduate or professional degree

44.2% · 55.8%

Educational Attainment Overview

Distribution and key education attainment rates for adults (25+)

Highest credential completed · adults 25+

	Stillwater Township	Sussex County	New Jersey
Population (25+)	3,227	106,277	6,523,202
Less than 9th grade	0.2%	1.4%	4.7%
9th–12th, no diploma	2.6%	3.1%	4.6%
High school diploma or GED	32.1%	28.2%	25.3%
Some college, no degree	22.1%	18.8%	15%
Associate's degree	10.4%	8.2%	6.7%
Bachelor's degree or higher	32.6%	40.3%	43.6%
Bachelor's degree	21.3%	25.8%	26.1%
Graduate or professional	11.3%	14.5%	17.6%
High School or higher	97.1%	95.4%	90.7%

Earnings by education level

percentage as applicable

Median Earnings

$59,253

Median earnings for adults 25+, by level

Less than HS graduate

$—

HS graduate

$47,023

Some college or associates

$53,152

Bachelors degree

$76,136

Graduate or professional degree

$76,250

Poverty Rate

1.5%

for ages 25+, with bachelors degree or higher

Less than HS graduate

4.3%

HS graduate

3.1%

Some college or associates

4.1%

Bachelors degree or higher

1.5%

Outcomes by Education Level

Earnings and poverty rates across education levels (25+)

Adults 25+

	Stillwater Township	Sussex County	New Jersey
Median earnings
Population 25+, with earnings	$59,253	$69,308	$63,226
Less than high school graduate	$—	$42,428	$33,651
High school graduate (includes equivalency)	$47,023	$55,166	$42,773
Some college or associate's degree	$53,152	$60,145	$51,787
Bachelor's degree	$76,136	$78,719	$81,924
Graduate or professional degree	$76,250	$98,511	$105,179
Poverty rates
Less than high school graduate	4.3%	11.1%	21.1%
High school graduate (includes equivalency)	3.1%	8.3%	12.6%
Some college or associate's degree	4.1%	5.6%	8.1%
Bachelor's degree or higher	1.5%	2.1%	3.7%

Insights for Stillwater Township, by topic

Income By year By race By age By gender

Population By year By race By age By gender

About Neilsberg Research

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