Arnold, Missouri Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Arnold, Missouri is 20,884 as of the 2023 American Community Survey, making it the 37th-largest city in Missouri. The median household income is $75,194, the median home value is $209,700, and the median age is 39.9.
The population has grown 0.8% since 2010 (20,873 → 21,036).
20,884
Population
1812
People / sq mi
$75,194
Median Income
$209,700
Median Home Value
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Arnold covers 11.5 sq mi of land at 1812 people per square mile.
About Arnold, MO
Homeownership is the standout figure in Arnold: 79.6% of homes are owner-occupied, higher than the national rate. With 20,884 residents, Arnold is a city in Missouri. It ranks #37 among cities in Missouri by population.
The typical household here earns about $75,194, near the US median of $78,538. Poverty runs at 6.8%, below the national 12.4%. Homes are comparatively cheap — a median value of $209,700, with typical rent around $1,085.
Fewer adults hold degrees here than in most comparable places — 24.0%, below the national 35.0%. Most workers commute: only 8.1% work from home, below the national 14.0%, and the average commute runs about 28 minutes each way.
The ownership rate anchors the housing story in Arnold, and tends to move with the age structure and home-value figures above.
Arnold city Population History (2010-2024)
The city of Arnold city had a population of 20,873 in 2010 and 21,036 in 2024, a 0.8% growth over 14 years. The peak was 21,200 in 2015. Average annual growth rate: 0.06%.
21,036
Population (2024)
20,873
Population (2010)
21,200
Peak (2015)
0.06%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 20,873 |
| 2011 | 20,892 |
| 2012 | 20,980 |
| 2013 | 21,025 |
| 2014 | 21,130 |
| 2015 | 21,200 |
| 2016 | 21,163 |
| 2017 | 21,151 |
| 2018 | 21,123 |
| 2019 | 21,091 |
| 2020 | 20,908 |
| 2021 | 20,907 |
| 2022 | 20,884 |
| 2023 | 21,102 |
| 2024 | 21,036 |
Race & Ethnicity
| White | 90.9% |
| Black or African American | 0.2% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.2% |
| Two or More Races | 0.0% |
Economy & Income
$75,194
Median Household Income
$37,093
Per Capita Income
6.8%
Poverty Rate
2.7%
Unemployment Rate
Housing
$209,700
Median Home Value
$1,085
Median Rent
79.6%
Owner-Occupied
Education
91.0%
High School+
24.0%
Bachelor's+
Commute
0.0%
Drive Alone
85.3%
Public Transit
8.1%
Work From Home
27.5 min
Avg Commute
Community Profile
16.6%
Foreign Born
92.7%
Non-English at Home
6.7%
Veterans
13.3%
With Disability
92.4%
Health Insurance
95.0%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 20.1% |
| Manufacturing | 13.2% |
| Finance, Insurance & Real Estate | 12.5% |
| Construction | 9.2% |
| Education, Health Care & Social Services | 8.4% |
| Information | 5.7% |
| Public Administration | 5.3% |
| Retail Trade | 4.5% |
| Arts, Entertainment & Food Services | 3.9% |
| Transportation & Warehousing | 1.5% |
| Agriculture & Mining | 0.1% |
Largest cities in Missouri
Largest counties in Missouri
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Metro areas in Missouri
City rankings
Frequently Asked Questions
Arnold, Missouri has a population of 20,884 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 37th-largest city in Missouri.
The median household income in Arnold, Missouri is $75,194, with 6.8% of residents living below the federal poverty level.
The median home value in Arnold, Missouri is $209,700, with median monthly rent at $1,085 and a homeownership rate of 79.6%.
The median age in Arnold, Missouri is 39.9 years. The population is 49.6% male and 50.4% female.
The population has grown 0.8% since 2010 (20,873 → 21,036).
Where to stay in Arnold
Visiting or relocating to Arnold, MO? Compare hotels and short-term rentals across the metro — live availability and prices.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.