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).
Arnold city, MO Climate
Arnold city, MO has an average annual temperature of 13.2°C (56°F) and receives about 981 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
13.2°C
Avg Temp
981
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -1° / 30° | 51 mm |
| February | 2° / 35° | 56 mm |
| March | 7° / 45° | 92 mm |
| April | 13° / 56° | 93 mm |
| May | 19° / 65° | 104 mm |
| June | 23° / 74° | 89 mm |
| July | 26° / 79° | 91 mm |
| August | 25° / 77° | 81 mm |
| September | 21° / 69° | 84 mm |
| October | 14° / 58° | 71 mm |
| November | 8° / 46° | 90 mm |
| December | 2° / 35° | 79 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Arnold city, MO
The most comfortable months to visit Arnold city, MO are typically September, June and May, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 32°C high). The coldest is January (near -6°C low). May is usually the wettest month.
Where to stay near Arnold
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.