Island Lake township, Mahnomen County, MN

Township in Mahnomen County, MN, US

By Neilsberg Research

Last updated May 1, 2026

Key Indicators

A quick look at key numbers

Population

358

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

Median Age

27.9

years ∙ half population younger than 27.9, half older

Diversity Index

36.5%

chance two random people differ in race and ethnicity

Nativity

0.8%

foreign-born population

99.2%Native

0.8% Foreign-born

Geographic Context

Location, size, and surroundings

About

Island Lake township, Mahnomen County is a township in Mahnomen County, Minnesota, United States.

Location

Township in Mahnomen County, MN, US

Co-ordinates

DEC47.454496° N, 95.616723° W

DMS47° 27′ 16.19″ N, 95° 37′ 00.20″ W

Population Density & area

10.41/sq mi (4.02/km²)

Total Area

36.6 sq mi (94.8 km²)

Land Area

34.4 sq mi (89.1 km²) · 94%

Water Area

2.2 sq mi (5.7 km²) · 6%

Demographics & Living

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

Population Composition

Key characteristics of the population

Sex Distribution

52% male

Male 52%

Female 48%

males per 100 females

Island Lake township 108.1

Mahnomen County 104.3

Minnesota 100.4

Nativity

0.8%

foreign-born population

99.2%Native

0.8% Foreign-born

% Foreign-born

Island Lake township 0.8%

Mahnomen County 1%

Minnesota 8.7%

Age Distribution

How the population is spread across age groups

Median Age

27.9

years ∙ half population younger than 27.9, half older

Island Lake township

27.9

Mahnomen County

35.4

Minnesota

38.8

Dependency ratio

104.6

dependents per 100 working-age adults

Island Lake township 104.6

Mahnomen County 95.5

Minnesota 67.1

AGE DISTRIBUTION

Distribution of age group

Median age

	Island Lake township	Mahnomen County	Minnesota
Age Group
Children (Under 18)	36%	31%	22.9%
Working age (18-64)	48.9%	51.1%	59.8%
Senior (65+)	15.1%	17.9%	17.3%
Dependency ratio
Total dependency ratio	104.6	95.5	67.1
Child dependency ratio	73.7	60.6	38.2
Old-age dependency ratio	30.9	34.9	28.9

Racial & Ethnic Composition

Racial and ethnic makeup and how it compares

Race & Ethnicity

White

78.8%

Black

0.8%

Asian

Hispanic

5.9%

Other

14.5%

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

36.5%

chance two random people differ in race and ethnicity

Island Lake township 36.5%

Mahnomen County 66%

Minnesota 41%

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 Island Lake township population

	Island Lake township	Mahnomen County	Minnesota
Hispanic or Latino	5.9%	4.1%	6.4%
Mexican	0.8%	2.6%	3.9%
Puerto Rican	0%	0.6%	0.3%
Cuban	0%	0.2%	0.1%
Other Hispanic / Latino	5%	0.7%	2%
Not Hispanic or Latino	94.1%	95.9%	93.6%
One race	89.1%	79.2%	89.1%
White	78.8%	44.4%	75.9%
Black or African American	0.8%	0.1%	6.9%
American Indian and Alaska Native	8.9%	33.6%	0.7%
Asian	0%	0.5%	5.1%
Native Hawaiian and Other Pacific Islander	0%	0.1%	0%
Some Other Race	0.6%	0.5%	0.5%
Two or more races (Multiracial)	5%	16.7%	4.5%

Household & Families Composition

Household size, type, and family structure

Household structure

69.8% family

Family 69.8%

Non family 30.2%

% family households

Island Lake township 69.8%

Mahnomen County 67.5%

Minnesota 62.3%

Average household size

3.09

persons per household

Island Lake township

3.09

Mahnomen County

2.8

Minnesota

2.43

Household & Family COMPOSITION

Households

Percentage of Island Lake township population

	Island Lake township	Mahnomen County	Minnesota
Total households	116	1,885	2,307,955
Average houshold size	3.09	2.8	2.43
Family households	81	1,273	1,438,404
Average family size	3.88	3.38	3.04
Married couple family	62	734	1,129,003
Other families	19	539	309,401
Male householder	9	166	102,922
Female householder	10	373	206,479
Non-family households	35	612	869,551
One-person households	32	535	686,475
Male householder	27	300	320,418
Senior (65+) living alone	14	129	97,557
Female householder	5	235	366,057
Senior (65+) living alone	5	138	186,557
Other living arrangements	3	77	183,076

Housing Profile

Housing stock, ownership, rentals, and cost burdens

Total housing units

274

housing units

Island Lake township 274

Mahnomen County 2,547

Minnesota 2,545,030

Occupancy status

42.3% occupied

Occupied 42.3%

Vacant 57.7%

vacancy rate

Island Lake township 57.7%

Mahnomen County 26%

Minnesota 9.3%

Housing Characteristics

How the housing supply is structured and used

Types of Housing unit

85.7%

Single family houses

85.7%

Apartments in multi-unit structures

Mobile homes

14.2%

Boat, RV, van, etc

Median Year Built

1993

Half of houses were built before 1993, and half after.

Historic ∙ 1939 or earlier

9.5%

Postwar & mid-century ∙ 1940 - 1969

21.9%

Late 20th century ∙ 1970 - 1999

39.4%

Modern ∙ 2000 or later

29.3%

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

Housing Characteristics

Units, rooms & bedrooms

Physical characteristics of housing units

	Island Lake township	Mahnomen County	Minnesota
Rooms per unit
Median rooms	4.8	5.3	6.1
1–3 rooms	24.4%	13.1%	14.9%
4–6 rooms	51.1%	56.8%	41.4%
7+ rooms	24.4%	30.1%	43.7%
Bedrooms
No bedroom / studio	1.5%	1.2%	2.7%
1 bedroom	5.1%	8.1%	11.4%
2 bedrooms	45.6%	29.1%	24.5%
3 bedrooms	29.6%	38.1%	32.2%
4+ bedrooms	18.3%	23.6%	29.1%
At a glance
Median year built	1993	1977	1979
Total housing units	274	2,547	2,545,030

Occupancy Profile

Who is inside and how they use it

Homeownership

87.1% owners

Renter-occupied 12.9%

Owner-occupied 87.1%

homeownership rate

Island Lake township 87.1%

Mahnomen County 73.3%

Minnesota 72.2%

Average household size

3.08

Owner-occupied

3.13

Renter-occupied

owner-occupied average size

Island Lake township 3.08

Mahnomen County 2.82

Minnesota 2.59

Housing Characteristics

Occupied unit characteristics

Tenure, crowding, and utilities

	Island Lake township	Mahnomen County	Minnesota
Total occupied units	116	1,885	2,307,955
Year moved in
2020 or later	18.9%	14.7%	23.8%
2010 to 2019	47.4%	36.9%	38.9%
2000 to 2009	25%	19.3%	16.1%
1999 or earlier	8.6%	29.1%	21.2%
Occupants per room
1.00 or fewer	95.7%	95.3%	97.7%
1.01 to 1.50	2.6%	3.6%	1.5%
1.51 or more	1.7%	1.1%	0.8%
Vehicles availability
No vehicles	14.7%	9%	6.7%
1 vehicle	13.8%	30.4%	30.8%
2 vehicles	44.8%	31.1%	39.5%
3 or more vehicles	26.7%	29.5%	23.1%
House heating fuel used
Gas	46.5%	50.9%	75.9%
Electricity	29.3%	28%	19.4%
Solar	0%	0.1%	0.1%
Fuel oil, kerosene etc	2.6%	10.9%	1.3%
All other fuels	16.4%	8.8%	2.5%
No fuel used	5.2%	1.4%	0.9%
Selected characteristics
Lacking complete plumbing	5.2%	0.7%	0.4%
Lacking complete kitchen	6.9%	0.8%	0.7%
No telephone service available	8.6%	2.1%	0.7%

Housing Value

What owner-occupied units are worth

Median home value

$228,300

owner-occupied units

Median value(USD)

Island Lake township

$228,300

Mahnomen County

$161,900

Minnesota

$329,300

Housing Cost Burden

28.6%

of homeowners with a mortgage are cost-burdened

% Cost-Burdened Households

Owners with a mortgage

28.6%

Owners without a mortgage

19.2%

Renters

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

	Island Lake township	Mahnomen County	Minnesota
Property value
Median Value	$228,300	$161,900	$329,300
Under $100,000	14.9%	33.6%	7.7%
$100,000 - $200,000	26.8%	28.2%	13.3%
$200,000 - $300,000	25.7%	21.2%	22.6%
$300,000 - $500,000	26.7%	13.8%	36.9%
$500,000 - $1,000,000	5.9%	3.2%	17%
$1,000,000 and more	0%	0.1%	2.6%
Owner-occupied households
With a mortgage	48.5%	41.3%	64%
Without a mortgage	51.5%	58.7%	36%
Median monthly owner costs
With a mortgage	$1,443	$1,335	$1,947
Without a mortgage	$722	$529	$698
Gross rent
Median rent	$1,125	$696	$1,280

Education Profile

How educated is the community and how education pays off

Adults with a college degree

18.9%

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

Island Lake township 18.9%

Mahnomen County 16.2%

Minnesota 39.4%

Adults without a high school diploma

14.3%

of adults (25+) without a high school diploma

Island Lake township 14.3%

Mahnomen County 11.9%

Minnesota 6.1%

School Enrollment

Who is enrolled in school and at what level

School enrollment

population (age 3+) enrolled in school

Nursery / Preschool

1.1%

K–12

94.4%

College / Undergraduate

4.4%

Graduate / Professional

College-going rate (18-24 yr olds)

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

Island Lake township

Mahnomen County

20.1%

Minnesota

39.1%

Enrollment & school type

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

Population 3+ currently enrolled in a school

	Island Lake township	Mahnomen County	Minnesota
Total enrolled (age 3+)	90	1,506	1,385,086
Nursery / preschool	1.1%	6.9%	6.2%
K–12	94.4%	81.7%	69.9%
Kindergarten	13.3%	6.6%	5.2%
Elementary: Grades 1–4	31.1%	27%	20.6%
Elementary: Grades 5–8	33.3%	28%	21.7%
High School: Grades 9–12	16.7%	20.1%	22.4%
College or graduate school	4.4%	11.4%	23.9%
College, undergraduate	4.4%	9.6%	18.8%
Graduate, professional school	0%	1.9%	5.1%
College-going rate · 18-24 yr olds	0%	20.1%	39.1%
School type
Public school	85.6%	89.8%	83.3%
Private school	14.4%	10.2%	16.7%

Education Attainment by Level & Gender

What is the highest level of education completed among adults

Education attainment

196

population 25 years and over

Total adults (25+)

Less than 9th grade

6.6%

9th-12th, no diploma

7.7%

HS graduate

21.9%

Some college no degree

28.1%

Associates degree

16.8%

Bachelors degree

13.3%

Graduate or professional degree

5.6%

Attainment by gender

Male vs Female

Adults (25+) · Share within each education level

% male · % female

Less than 9th grade

61.5% · 38.5%

9th-12th, no diploma

33.3% · 66.7%

HS graduate

39.5% · 60.5%

Some college no degree

61.8% · 38.2%

Associates degree

48.5% · 51.5%

Bachelors degree

57.7% · 42.3%

Graduate or professional degree

54.5% · 45.5%

Educational Attainment Overview

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

Highest credential completed · adults 25+

	Island Lake township	Mahnomen County	Minnesota
Population (25+)	196	3,249	3,923,744
Less than 9th grade	6.6%	3.3%	2.7%
9th–12th, no diploma	7.7%	8.6%	3.4%
High school diploma or GED	21.9%	34%	23.3%
Some college, no degree	28.1%	23.5%	19.5%
Associate's degree	16.8%	14.4%	11.8%
Bachelor's degree or higher	18.9%	16.2%	39.4%
Bachelor's degree	13.3%	11.4%	25.6%
Graduate or professional	5.6%	4.7%	13.8%
High School or higher	85.7%	88.1%	93.9%

Earnings by education level

percentage as applicable

Median Earnings

$45,750

Median earnings for adults 25+, by level

Less than HS graduate

$46,875

HS graduate

$46,875

Some college or associates

$36,818

Bachelors degree

$61,875

Graduate or professional degree

$58,750

Poverty Rate

for ages 25+, with bachelors degree or higher

Less than HS graduate

21.4%

HS graduate

11.6%

Some college or associates

1.1%

Bachelors degree or higher

Outcomes by Education Level

Earnings and poverty rates across education levels (25+)

Adults 25+

	Island Lake township	Mahnomen County	Minnesota
Median earnings
Population 25+, with earnings	$45,750	$44,805	$58,615
Less than high school graduate	$46,875	$32,500	$36,257
High school graduate (includes equivalency)	$46,875	$38,333	$42,951
Some college or associate's degree	$36,818	$44,122	$51,845
Bachelor's degree	$61,875	$63,333	$73,301
Graduate or professional degree	$58,750	$67,500	$89,644
Poverty rates
Less than high school graduate	21.4%	28.1%	23.7%
High school graduate (includes equivalency)	11.6%	16.1%	12.3%
Some college or associate's degree	1.1%	15.2%	7.8%
Bachelor's degree or higher	0%	4.2%	3.2%

Insights for Island Lake township, Mahnomen County, by topic

Income By year By race By age By gender

Population By year By race By age By gender

About Neilsberg Research

Neilsberg Research team are data scientists with expertise in processing, analysis and visualization of big data helping small businesses make right decisions.

Cite this page

Citation style

Url to be used as reference

This article is for informational purposes only and is not intended to be legal or tax advice. We recommend that you consult with a qualified professional such as a lawyer or accountant before making a decision. Many of the products and services featured here are from our affiliate partners. We may receive commissions on purchases made from our chosen links. Read advertiser disclosure.