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.

Arnold, MO Population, Income & Demographics 2026

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Demographics — 2024 ACS 5-Year Estimatesi

Census

Populationi

20,956

Median Agei

39.7

Race & Ethnicityi

White

88%18,451

Two or More

6.7%1,413

Hispanic/Latino

2.6%548

Asian

1.8%380

Other

0.4%91

Black

0.2%52

Native Hawaiian/Pacific Islander

0.1%14

American Indian/Alaska Native

0%7

Educational Attainment (Age 25+)i

GED/Alternative

5.6%863

High School Diploma

27.1%4,199

Some College (<1 yr)

7.8%1,209

Some College (1+ yr)

13.6%2,102

Associate's Degree

11.3%1,744

Bachelor's Degree

17.3%2,674

Master's Degree

5.5%852

Professional Degree

1.3%202

Doctorate

1.3%204

HS or Higher

90.7%

BA or Higher

25.4%

Graduate+

8.1%

Housingi

Median Home Valuei

$220,000

Median Renti

$1,112

Tenure

Owner-Occupied

79.8%6,699

Renter-Occupied

20.2%1,695

Total Units

8,982

Homeownership

79.8%

Vacancy Rate

6.5%

Home Values

Under $50K

3.2%213

$50K–$100K

3.8%255

$100K–$150K

7.6%512

$150K–$200K

26%1,742

$200K–$300K

36.5%2,446

$300K–$500K

20.5%1,371

$500K–$1M

2.4%160

Rent Distribution

Under $500

$500–$750

147

$750–$1,000

372

$1,000–$1,250

513

$1,250–$1,500

278

$1,500–$2,000

167

$2,000+

Year Built

2020 or later

0.9%77

2010–2019

5.3%473

2000–2009

10.1%905

1990–1999

18.1%1,626

1980–1989

11.4%1,024

1970–1979

13.3%1,195

1960–1969

25.7%2,307

1950–1959

12%1,077

1940–1949

1.5%136

1939 or earlier

1.8%162

Heating Fuel

Utility Gas

65.4%5,489

Electricity

30.9%2,591

Bottled/LP Gas

1.8%148

Fuel Oil

1%80

Wood

0.6%54

No Fuel

0.4%32

Economyi

Median Household Incomei

$78,370

Mean Household Incomei

$91,307

Per Capita Incomei

$37,598

Poverty Ratei

8.1%

Unemploymenti

2.8%

Labor Forcei

11,237

Household Income Distribution

Under $10K

2.1%177

$10K–$15K

2.8%236

$15K–$20K

1.7%146

$20K–$25K

5.9%494

$25K–$30K

3.2%265

$30K–$35K

4.3%364

$35K–$40K

2.4%199

$40K–$45K

3.2%268

$45K–$50K

2.4%202

$50K–$60K

9.1%764

$60K–$75K

11.1%933

$75K–$100K

14.7%1,232

$100K–$125K

14.3%1,204

$125K–$150K

9.6%803

$150K–$200K

8%671

$200K+

5.2%436

Ancestry & Heritage

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

Foreign-Born Populationi

Foreign-Borni

1,1075.3%

By Region

Top Countries

Germany

188

China

Mexico

Philippines

Canada

India

Korea

Social Characteristicsi

Marital Status (15+)i

Veteransi

1,046(6.3% of civilian adults)

Health Insurancei

92.5%Insured

7.5%Uninsured