City safety & data profile

ArnoldMO

Arnold, MO is a 21K-resident city in Jefferson County with a median household income of $78,370.

Jefferson County, Missouri. Federal health, economic, and safety indicators for Arnold, drawn from the U.S. Census Bureau American Community Survey, CDC PLACES, and CMS Hospital Compare. Arnold has a population larger than 47% of the 4,640 U.S. cities Areazine tracks, and a median home value of $220,000.

Data updated 2026-07-20

21K
Population
Top 53%
By size
$78,370
Median income
$220,000
Median home
8.2%
Poverty rate

The read on Arnold

Arnold posts a median household income higher than 47% of U.S. cities Areazine tracks.

Top 53%
by median income, US cities

Where Arnold income ranks nationally

Median household income vs. every place Areazine profiles (place-level ACS)

$78,370 Bottom 47% higher than 47% of 3,889 places Areazine profiles

$0–$20,000: 0 places Areazine profiles (0%). Below this entry. $20,000–$40,000: 71 places Areazine profiles (2%). Below this entry. $40,000–$60,000: 788 places Areazine profiles (20%). Below this entry. $60,000–$80,000: 1,055 places Areazine profiles (27%). This entry sits in this band. $80,000–$100,000: 768 places Areazine profiles (20%). Above this entry. $100,000–$120,000: 515 places Areazine profiles (13%). Above this entry. $120,000–$140,000: 308 places Areazine profiles (8%). Above this entry. $140,000–$160,000: 171 places Areazine profiles (4%). Above this entry. $160,000–$180,000: 92 places Areazine profiles (2%). Above this entry. $180,000–$200,000: 47 places Areazine profiles (1%). Above this entry. $200,000–$220,000: 28 places Areazine profiles (1%). Above this entry. $220,000–$240,000: 18 places Areazine profiles (0%). Above this entry. $240,000–$260,000: 28 places Areazine profiles (1%). Above this entry. MO $0 $260,000 every profiled place, bucketed by value

Each bar is a $20K-wide band; taller bars hold more places Areazine profiles. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, American Community Survey (place-level) · 2024 ACS 5-year

The quick read

Reading Arnold, MO beyond the headline numbers

Arnold sits inside Jefferson County, Missouri, at roughly 38.43°N, -90.38°W. Population 21,357, $78,370 median household income. Median home value $220,000, median rent $1,112. Poverty rate 8.2%, read against that income figure since two cities on the same median can differ underneath it.

CDC PLACES: Arnold's highest-prevalence health measure is obesity at 39.4%, then short sleep duration at 36.3%.

Sources: U.S. Census ACS, CDC PLACES, CMS Hospital Compare, plus live alerts for Arnold from FEMA, NOAA, FDA, and CPSC. Comparison bars benchmark each metric against the national reference.

Population
21,357
Arnold
Median Income
$78,370
+15% vs avg
Median Home Value
$220,000
-3% vs avg
Median Age
39.7
years

10-Year Trends 2013–2024

County-level trend (Jefferson County) - Arnold's own historical series isn't separately published by the Census Bureau, so these year-over-year figures track the surrounding county, not the city alone.

20132024
Population
229K+4%
Median Income
$82,851+51%
Median Home Value
$237,200+56%
Poverty Rate
9%-20%
Unemployment
3.2%-67%

Economics

Economics indicators for Arnold, MO
IndicatorValue
Median Rent
$1,112/mo
Poverty Rate
8.2% -42% vs avg
Unemployment 2.8%
Bachelor's Degree+ 25.4%
Work From Home 8.1%
Public Transit 0%

Population

White 88.9%
African American 0.2%
Asian 1.8%
Two or More Ethnicities 6.5%

Health Profile 15 measures

Health Indicators

Obesity
39.4%
Short Sleep Duration
36.3%
High Blood Pressure
35.4%
Physical Inactivity
27.3%
Frequent Mental Distress
17.1%
Binge Drinking
15.9%
Current Smoking
15.7%
Frequent Physical Distress
13.9%
Diabetes
11.1%
Current Asthma
10.6%

Preventive Care

Dental Visit 61.6%
Annual Checkup 79%

Other Measures

Lack of Health Insurance
7.7%
Coronary Heart Disease
6.6%
Stroke
3.4%

Frequently Asked Questions 5

What is the population of Arnold, MO? ▼
Arnold, MO has a population of 21,357 people, located in Jefferson County, Missouri.
What is the median household income in Arnold? ▼
The median household income in Arnold, MO is $78,370 per year, per the U.S. Census ACS. The poverty rate is 8.2%.
What is the median home value in Arnold? ▼
The median home value in Arnold, MO is $220,000. Median rent is $1,112/month.
What are the top health concerns in Arnold? ▼
The top health indicators in Arnold include Obesity (39.4%), Short Sleep Duration (36.3%), High Blood Pressure (35.4%). Data from CDC PLACES.
What is the median age in Arnold? ▼
The median age in Arnold, MO is 39.7 years. 25.4% of residents have a bachelor's degree or higher.

Safety Context

Arnold, MO is located in Jefferson County, Missouri. With a population of 21K and a $78,370 median household income, the community faces health challenges including obesity and short sleep duration. Safety alerts for the Arnold area are monitored from federal and state agencies including FEMA, NOAA, FDA, and CPSC.

Safety Guides

How Product Recalls Work

CPSC, FDA & NHTSA recall process explained

Understanding Weather Alerts

Watch vs warning vs advisory explained

Earthquake Magnitude Explained

What the numbers mean & when to act
All safety guides →

Primary source data

EPA Outdoor Air Quality Data

Federal monitoring network, every measurement we report

AirNow - Missouri

Real-time AQI for every monitored Missouri location

National Weather Service

NOAA active watches, warnings, advisories

CDC Air Quality & Health

Health-impact reference for every AQI category

EPA NAAQS standards

National Ambient Air Quality Standards, the regulatory thresholds

Nearby Cities 8

Oakville, MO 36K Mehlville, MO 28K Concord, MO 16K Crestwood, MO 12K Affton, MO 20K Lemay, MO 17K Kirkwood, MO 28K Webster Groves, MO 23K
All cities in Missouri → Compare Arnold vs Oakville → All comparisons → Browse all cities

Using Arnold's profile

Use this as a starting research checklist, not a verdict on whether to live here.

  • Check live recalls, weather and hazard alerts scoped to the Arnold area before relying on national headlines. Check your area
  • Read the poverty rate alongside the income figure, two places with the same median can have very different realities.
  • Compare Arnold against Missouri peers on any ranking lens. Explore Missouri

Population and economics (income, home value, poverty, education) are place-level U.S. Census ACS; health is CDC PLACES; hospital counts reflect facilities in and around the city.

Data Sources

All data on this page comes from official U.S. government sources. Population and economic data from the Census Bureau American Community Survey (2024 5-year estimates, place geography). Health data from the CDC PLACES program (2023). Hospital ratings from CMS Hospital Compare (2024). Climate data from NOAA. Education data from NCES. Cost of living from Bureau of Economic Analysis. Crime statistics, where referenced on Areazine, originate from the FBI Crime Data Explorer. Housing market figures referenced on Areazine come from HUD Fair Market Rents. Census economics and population are at place geography; some health and hospital indicators are reported at the county level (Jefferson County) where that is the smallest published unit.

Every figure on Areazine is published directly from official U.S. government sources, no number is typed in by an editor. City demographic and health figures are compiled directly from U.S. Census, CDC, and CMS releases, updated quarterly within 30 days of upstream release. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026.