Algonquin, IL

Village in IL, US

By Neilsberg Research

Last updated May 1, 2026

Key Indicators

A quick look at key numbers

Population

30,067

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

Median Age

41.4

years ∙ half population younger than 41.4, half older

Diversity Index

44.2%

chance two random people differ in race and ethnicity

Nativity

12.3%

foreign-born population

87.7%Native

12.3% Foreign-born

Geographic Context

Location, size, and surroundings

About

Algonquin is a village within Kane and McHenry counties, Illinois, United States.

Location

Village in IL, US

Co-ordinates

DEC42.159466° N, 88.321873° W

DMS42° 09′ 34.08″ N, 88° 19′ 18.74″ W

Population Density & area

2,405/sq mi (928/km²)

Total Area

12.7 sq mi (32.9 km²)

Land Area

12.5 sq mi (32.4 km²) · 98.4%

Water Area

0.2 sq mi (0.5 km²) · 1.6%

Demographics & Living

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

Population Composition

Key characteristics of the population

Sex Distribution

50.2% male

Male 50.2%

Female 49.8%

males per 100 females

Algonquin 100.7

Illinois 97.7

United States 98

Nativity

12.3%

foreign-born population

87.7%Native

12.3% Foreign-born

% Foreign-born

Algonquin 12.3%

Illinois 14.7%

United States 14.1%

Age Distribution

How the population is spread across age groups

Median Age

41.4

years ∙ half population younger than 41.4, half older

Algonquin

41.4

Illinois

United States

38.9

Dependency ratio

55.7

dependents per 100 working-age adults

Algonquin 55.7

Illinois 63.5

United States 64.4

AGE DISTRIBUTION

Distribution of age group

Median age

	Algonquin	Illinois	United States
Age Group
Children (Under 18)	20.8%	21.8%	22%
Working age (18-64)	64.2%	61.2%	60.8%
Senior (65+)	15%	17%	17.2%
Dependency ratio
Total dependency ratio	55.7	63.5	64.4
Child dependency ratio	32.4	35.7	36.1
Old-age dependency ratio	23.3	27.8	28.3

Racial & Ethnic Composition

Racial and ethnic makeup and how it compares

Race & Ethnicity

White

72.7%

Black

2.8%

Asian

5.3%

Hispanic

15.6%

Other

3.6%

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

44.2%

chance two random people differ in race and ethnicity

Algonquin 44.2%

Illinois 60.5%

United States 61.4%

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 Algonquin population

Racial and ethnic composition — Algonquin vs Illinois vs United States. Source: ACS 2020-2024 5-Year Estimates.
	Algonquin	Illinois	United States
Hispanic or Latino	15.6%	18.8%	19.3%
Mexican	10.8%	14.4%	11.3%
Puerto Rican	1.6%	1.6%	1.8%
Cuban	0.5%	0.3%	0.8%
Other Hispanic / Latino	2.7%	2.5%	5.5%
Not Hispanic or Latino	84.4%	81.2%	80.7%
One race	80.9%	77.8%	76.4%
White	72.7%	58.1%	57.4%
Black or African American	2.8%	13.3%	11.9%
American Indian and Alaska Native	0.1%	0.1%	0.5%
Asian	5.3%	5.9%	5.9%
Native Hawaiian and Other Pacific Islander	0%	0%	0.2%
Some Other Race	0.1%	0.4%	0.6%
Two or more races (Multiracial)	3.5%	3.4%	4.3%

Household & Families Composition

Household size, type, and family structure

Household structure

78.1% family

Family 78.1%

Non family 21.9%

% family households

Algonquin 78.1%

Illinois 62.2%

United States 64.2%

Average household size

2.74

persons per household

Algonquin

2.74

Illinois

2.46

United States

2.53

Household & Family COMPOSITION

Households

Percentage of Algonquin population

	Algonquin	Illinois	United States
Total households	10,968	5,036,449	129,227,496
Average houshold size	2.74	2.46	2.53
Family households	8,561	3,130,978	82,990,528
Average family size	3.06	3.14	3.14
Married couple family	7,251	2,282,435	60,637,388
Other families	1,310	848,543	22,353,140
Male householder	638	248,521	6,572,819
Female householder	672	600,022	15,780,321
Non-family households	2,407	1,905,471	46,236,968
One-person households	1,844	1,569,881	37,140,836
Male householder	891	712,191	16,871,444
Senior (65+) living alone	237	210,051	5,225,110
Female householder	953	857,690	20,269,392
Senior (65+) living alone	643	417,870	10,089,070
Other living arrangements	563	335,590	9,096,132

Housing Profile

Housing stock, ownership, rentals, and cost burdens

Total housing units

11,151

housing units

Algonquin 11,151

Illinois 5,457,452

United States 143,775,355

Occupancy status

98.4% occupied

Occupied 98.4%

Vacant 1.6%

vacancy rate

Algonquin 1.6%

Illinois 7.7%

United States 10.1%

Housing Characteristics

How the housing supply is structured and used

Types of Housing unit

91.6%

Single family houses

91.6%

Apartments in multi-unit structures

8.5%

Mobile homes

Boat, RV, van, etc

Median Year Built

1994

Half of houses were built before 1994, and half after.

Historic ∙ 1939 or earlier

3.5%

Postwar & mid-century ∙ 1940 - 1969

7.2%

Late 20th century ∙ 1970 - 1999

60.1%

Modern ∙ 2000 or later

29.1%

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

Housing Characteristics

Units, rooms & bedrooms

Physical characteristics of housing units

	Algonquin	Illinois	United States
Rooms per unit
Median rooms	7.2	5.6	5.5
1–3 rooms	6.1%	14.6%	15.1%
4–6 rooms	33.6%	50.9%	51.6%
7+ rooms	60.4%	34.6%	33.4%
Bedrooms
No bedroom / studio	1.3%	3.1%	2.9%
1 bedroom	5.6%	11.5%	10.9%
2 bedrooms	14.3%	27.7%	25%
3 bedrooms	28.9%	35.8%	38.7%
4+ bedrooms	49.9%	21.7%	22.4%
At a glance
Median year built	1994	1971	1981
Total housing units	11,151	5,457,452	143,775,355

Occupancy Profile

Who is inside and how they use it

Homeownership

88.2% owners

Renter-occupied 11.8%

Owner-occupied 88.2%

homeownership rate

Algonquin 88.2%

Illinois 67.1%

United States 65.2%

Average household size

2.82

Owner-occupied

2.14

Renter-occupied

owner-occupied average size

Algonquin 2.82

Illinois 2.62

United States 2.64

Housing Characteristics

Occupied unit characteristics

Tenure, crowding, and utilities

	Algonquin	Illinois	United States
Total occupied units	10,968	5,036,449	129,227,496
Year moved in
2020 or later	16.5%	23.3%	24.8%
2010 to 2019	37.8%	38.1%	39.6%
2000 to 2009	24.2%	17.3%	16.4%
1999 or earlier	21.5%	21.3%	19.1%
Occupants per room
1.00 or fewer	99.2%	97.5%	96.6%
1.01 to 1.50	0.6%	1.6%	2.2%
1.51 or more	0.3%	0.8%	1.2%
Vehicles availability
No vehicles	6.1%	11%	8.4%
1 vehicle	18.2%	35.7%	33.1%
2 vehicles	47.1%	35.1%	36.6%
3 or more vehicles	28.6%	18.3%	21.9%
House heating fuel used
Gas	94.1%	79.5%	51.4%
Electricity	5.9%	18.6%	41.3%
Solar	0%	0.1%	0.3%
Fuel oil, kerosene etc	0%	0.1%	3.9%
All other fuels	0%	0.8%	2%
No fuel used	0%	0.8%	1.2%
Selected characteristics
Lacking complete plumbing	0.6%	0.3%	0.4%
Lacking complete kitchen	1.5%	0.8%	0.8%
No telephone service available	0.6%	0.8%	0.9%

Housing Value

What owner-occupied units are worth

Median home value

$351,000

owner-occupied units

Median value(USD)

Algonquin

$351,000

Illinois

$263,300

United States

$332,700

Housing Cost Burden

21%

of homeowners with a mortgage are cost-burdened

% Cost-Burdened Households

Owners with a mortgage

21%

Owners without a mortgage

11.4%

Renters

45.5%

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

	Algonquin	Illinois	United States
Property value
Median Value	$351,000	$263,300	$332,700
Under $100,000	3.5%	13.7%	11.4%
$100,000 - $200,000	5.1%	21.5%	15.8%
$200,000 - $300,000	25.9%	22.3%	17.8%
$300,000 - $500,000	57.1%	27.7%	26.9%
$500,000 - $1,000,000	8.1%	12.1%	20.9%
$1,000,000 and more	0.3%	2.7%	7.1%
Owner-occupied households
With a mortgage	74.9%	60.8%	60.6%
Without a mortgage	25.1%	39.2%	39.4%
Median monthly owner costs
With a mortgage	$2,307	$1,987	$1,963
Without a mortgage	$1,023	$792	$638
Gross rent
Median rent	$1,723	$1,274	$1,413

Education Profile

How educated is the community and how education pays off

Adults with a college degree

43.6%

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

Algonquin 43.6%

Illinois 37.8%

United States 35.7%

Adults without a high school diploma

4.3%

of adults (25+) without a high school diploma

Algonquin 4.3%

Illinois 9.6%

United States 10.4%

School Enrollment

Who is enrolled in school and at what level

School enrollment

6,827

population (age 3+) enrolled in school

Nursery / Preschool

7.5%

K–12

62%

College / Undergraduate

23.1%

Graduate / Professional

7.4%

College-going rate (18-24 yr olds)

49.6%

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

Algonquin

49.6%

Illinois

41.4%

United States

40.9%

Enrollment & school type

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

Population 3+ currently enrolled in a school

	Algonquin	Illinois	United States
Total enrolled (age 3+)	6,827	3,051,569	80,089,790
Nursery / preschool	7.5%	6.3%	5.7%
K–12	62%	67.3%	67.6%
Kindergarten	3.7%	4.9%	5%
Elementary: Grades 1–4	20.9%	19.5%	19.8%
Elementary: Grades 5–8	16.9%	20.8%	21%
High School: Grades 9–12	20.6%	22.1%	21.7%
College or graduate school	30.5%	26.4%	26.7%
College, undergraduate	23.1%	19.8%	21%
Graduate, professional school	7.4%	6.6%	5.8%
College-going rate · 18-24 yr olds	49.6%	41.4%	40.9%
School type
Public school	87.1%	80.5%	82%
Private school	12.9%	19.5%	18%

Education Attainment by Level & Gender

What is the highest level of education completed among adults

Education attainment

21,225

population 25 years and over

Total adults (25+)

Less than 9th grade

1.6%

9th-12th, no diploma

2.7%

HS graduate

19.3%

Some college no degree

20.9%

Associates degree

11.9%

Bachelors degree

27.3%

Graduate or professional degree

16.3%

Attainment by gender

Male vs Female

Adults (25+) · Share within each education level

% male · % female

Less than 9th grade

58.1% · 41.9%

9th-12th, no diploma

41% · 59%

HS graduate

49% · 51%

Some college no degree

57% · 43%

Associates degree

49.1% · 50.9%

Bachelors degree

50.1% · 49.9%

Graduate or professional degree

43.4% · 56.6%

Educational Attainment Overview

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

Highest credential completed · adults 25+

	Algonquin	Illinois	United States
Population (25+)	21,225	8,767,004	230,807,303
Less than 9th grade	1.6%	4.6%	4.7%
9th–12th, no diploma	2.7%	5%	5.7%
High school diploma or GED	19.3%	25.1%	26%
Some college, no degree	20.9%	19.2%	19.1%
Associate's degree	11.9%	8.3%	8.8%
Bachelor's degree or higher	43.6%	37.8%	35.7%
Bachelor's degree	27.3%	22.6%	21.6%
Graduate or professional	16.3%	15.3%	14.1%
High School or higher	95.7%	90.5%	89.6%

Earnings by education level

percentage as applicable

Median Earnings

$72,314

Median earnings for adults 25+, by level

Less than HS graduate

$36,450

HS graduate

$42,724

Some college or associates

$68,895

Bachelors degree

$82,773

Graduate or professional degree

$94,241

Poverty Rate

2.2%

for ages 25+, with bachelors degree or higher

Less than HS graduate

9.8%

HS graduate

4.2%

Some college or associates

1.6%

Bachelors degree or higher

2.2%

Outcomes by Education Level

Earnings and poverty rates across education levels (25+)

Adults 25+

	Algonquin	Illinois	United States
Median earnings
Population 25+, with earnings	$72,314	$55,582	$52,696
Less than high school graduate	$36,450	$34,655	$32,485
High school graduate (includes equivalency)	$42,724	$40,965	$40,153
Some college or associate's degree	$68,895	$47,813	$47,260
Bachelor's degree	$82,773	$73,326	$70,044
Graduate or professional degree	$94,241	$91,623	$90,720
Poverty rates
Less than high school graduate	9.8%	21.6%	24.2%
High school graduate (includes equivalency)	4.2%	14.4%	14.4%
Some college or associate's degree	1.6%	9.9%	9.8%
Bachelor's degree or higher	2.2%	4.5%	4.5%

Insights for Algonquin, 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.

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