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
Arnold covers 11.5 sq mi of land at 1812 people per square mile.
About Arnold, MO
Arnold is a city in Missouri with a population of 20,884. It ranks #37 among cities in Missouri by population. The median age is 39.9, in line with the national median. The population is 49.6% male and 50.4% female.
The median household income in Arnold is $75,194, near the US median of $74,580. 6.8% of residents live below the federal poverty level. Home values sit at a median of $209,700, with monthly rent averaging $1,085. The homeownership rate of 79.6% is higher than the national rate of 64.8%.
Educational attainment in Arnold reflects 24.0% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 8.1% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 27.5 minutes each way.
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
Part of Missouri
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).
More from Missouri
Population 508,233
Population 293,109
Population 169,432
Population 127,200
Population 121,944
Full rankings of Missouri cities by population
Statewide data for Missouri
Population, race, income, age, and trends across Missouri
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.