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.

Big Rock, IL Population, Income & Demographics 2026

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Demographics — 2024 ACS 5-Year Estimatesi

Census

Populationi

1,548

Median Agei

49.4

Race & Ethnicityi

White

70.8%1,096

Two or More

18.4%285

Hispanic/Latino

9.8%152

Asian

0.8%12

Black

0.2%3

Educational Attainment (Age 25+)i

GED/Alternative

3.3%39

High School Diploma

55.8%654

Some College (<1 yr)

4.4%52

Some College (1+ yr)

8.5%100

Associate's Degree

4.8%56

Bachelor's Degree

14.7%173

Master's Degree

5%59

Professional Degree

0.3%3

Doctorate

0.6%7

HS or Higher

97.4%

BA or Higher

20.6%

Graduate+

5.9%

Housingi

Median Home Valuei

$337,900

Median Renti

—

Tenure

Owner-Occupied

98.9%613

Renter-Occupied

1.1%7

Total Units

635

Homeownership

98.9%

Vacancy Rate

2.4%

Home Values

$100K–$150K

2.1%13

$150K–$200K

3.6%22

$200K–$300K

21%129

$300K–$500K

68%417

$500K–$1M

5.2%32

Rent Distribution

$1,500–$2,000

Year Built

2010–2019

0.6%4

2000–2009

0.5%3

1990–1999

6.9%44

1980–1989

4.3%27

1970–1979

27.9%177

1960–1969

7.4%47

1950–1959

1.7%11

1940–1949

0.8%5

1939 or earlier

49.9%317

Heating Fuel

Utility Gas

93.4%579

Electricity

5.6%35

Bottled/LP Gas

1%6

Economyi

Median Household Incomei

$162,854

Mean Household Incomei

$146,550

Per Capita Incomei

$57,601

Poverty Ratei

3.2%

Unemploymenti

2.2%

Labor Forcei

1,001

Household Income Distribution

Under $10K

0.8%5

$15K–$20K

1.9%12

$20K–$25K

0.6%4

$25K–$30K

1.1%7

$30K–$35K

0.6%4

$40K–$45K

1.3%8

$45K–$50K

1.9%12

$50K–$60K

3.5%22

$60K–$75K

3.5%22

$75K–$100K

9.5%59

$100K–$125K

6.6%41

$125K–$150K

6%37

$150K–$200K

53.1%329

$200K+

9.4%58

Ancestry & Heritage

Self-reported ancestry groups. Residents may report multiple ancestries, so totals may exceed 100%.

Foreign-Born Populationi

Foreign-Borni

543.5%

By Region

Top Countries

Mexico

United Kingdom

Philippines

Korea

Commute & Transportationi

Workersi

942

Avg. Commutei

18.4 min

How People Get to Work

Travel Time to Work

Workforce

Total Employed

979

Occupations

Industries

Social Characteristicsi

Marital Status (15+)i

Veteransi

34(2.7% of civilian adults)

Health Insurancei

98.6%Insured

1.4%Uninsured