Where does this demographic data come from?

All demographic data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates, which samples about 3.5 million households annually. The 5-year estimates provide the most reliable data for small geographies like municipalities.

What is the difference between Census data and ACS data?

The decennial Census (conducted every 10 years) is a full population count focusing on basic demographics. The ACS is an ongoing survey that collects detailed data on income, education, housing, commute patterns, and more. ACS data is updated annually but represents averages over a 5-year period.

How accurate is this data for small towns?

For smaller municipalities, ACS estimates have wider margins of error because fewer residents are sampled. The 5-year estimates reduce this uncertainty by averaging over a longer period. For towns under 5,000 people, treat specific numbers as approximations rather than precise counts.

Darien, IL Population, Income & Demographics 2026

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Demographics — 2024 ACS 5-Year Estimatesi

Census

Populationi

21,879

Median Agei

44.4

Race & Ethnicityi

White

73.2%16,016

Asian

11.9%2,603

Hispanic/Latino

9.3%2,030

Two or More

2.8%606

Black

2.6%577

Other

0.2%42

American Indian/Alaska Native

0%5

Educational Attainment (Age 25+)i

GED/Alternative

1.9%312

High School Diploma

15.8%2,548

Some College (<1 yr)

6%966

Some College (1+ yr)

12.6%2,024

Associate's Degree

6.3%1,020

Bachelor's Degree

32.1%5,172

Master's Degree

13.7%2,208

Professional Degree

4.1%655

Doctorate

2.6%414

HS or Higher

95.1%

BA or Higher

52.4%

Graduate+

20.3%

Housingi

Median Home Valuei

$211,600

Median Renti

$900

Tenure

Owner-Occupied

80.7%393

Renter-Occupied

19.3%94

Total Units

524

Homeownership

80.7%

Vacancy Rate

7.1%

Home Values

Under $50K

1.5%6

$100K–$150K

6.4%25

$150K–$200K

36.1%142

$200K–$300K

34.1%134

$300K–$500K

21.9%86

Rent Distribution

Under $500

$500–$750

$750–$1,000

$1,000–$1,250

$1,250–$1,500

$1,500–$2,000

$2,000+

Year Built

2010–2019

5.2%27

2000–2009

18.7%98

1990–1999

14.1%74

1980–1989

7.8%41

1970–1979

10.1%53

1960–1969

4.4%23

1950–1959

18.9%99

1940–1949

4.6%24

1939 or earlier

16.2%85

Heating Fuel

Utility Gas

89.7%437

Electricity

10.3%50

Economyi

Median Household Incomei

$63,194

Mean Household Incomei

$64,359

Per Capita Incomei

$27,733

Poverty Ratei

9.6%

Unemploymenti

5.7%

Labor Forcei

562

Household Income Distribution

Under $10K

16%78

$10K–$15K

0.6%3

$15K–$20K

0.6%3

$20K–$25K

3.9%19

$25K–$30K

1.2%6

$30K–$35K

2.5%12

$35K–$40K

4.9%24

$40K–$45K

7%34

$45K–$50K

2.5%12

$50K–$60K

10.1%49

$60K–$75K

11.3%55

$75K–$100K

17.2%84

$100K–$125K

11.9%58

$125K–$150K

5.3%26

$150K–$200K

3.3%16

$200K+

1.6%8

Social Characteristicsi

Marital Status (15+)i

Veteransi

56(6.7% of civilian adults)