Arnold, MO
Population 20,884 · Missouri
About Arnold, MO
Arnold is a mid-sized city in Missouri with a population of 20,884 residents. The median household income is $75,194 per year, which is above the national average. The median age in Arnold is 39.9 years.
Housing in Arnold has a median home value of $209,700 and median monthly rent of $1,085. Of the 9,202 total housing units, the majority are owner-occupied, with 6,794 owner-occupied and 1,739 renter-occupied units.
The unemployment rate in Arnold is 4.2% and the poverty rate is 7.7%. 24.0% of residents hold a bachelor's degree or higher. The average commute time is 27.5 minutes.
How Arnold Ranks in Missouri
Cost of Living in Arnold, MO
Compared to national averages, Arnold has a median household income of $75,194 (0% above the national median of $75,149). Home values average $209,700, which is 14% below the national median. Monthly rent at $1,085 is 7% below the US average of $1,163. Within Missouri, Arnold's income is 23% above the state average of $61,047, and home values are 39% above the state median of $150,786.
Why Live in Arnold, MO?
Arnold offers a strong local economy with a median household income of $75,194, well above the national average, and affordable housing with a median home value of $209,700, below the US average of $244,900, and rent that’s lower than the national average at $1,085/month. Additionally, the city features a low poverty rate of 7.7%, better than the national average.
Arnold has a population of 20,884 with a median age of 39.9 years. Compare Arnold with other cities to see how it stacks up, or explore all cities in Missouri.
Similar Cities Near Arnold
Cities in Missouri with a similar population size.
| City | Population | Median Income | Home Value | |
|---|---|---|---|---|
| Old Jamestown | 21,121 | $107,250 | $230,100 | Compare |
| Rolla | 20,144 | $42,518 | $177,400 | Compare |
| Affton | 20,035 | $77,337 | $200,300 | Compare |
| Sedalia | 21,869 | $50,668 | $136,500 | Compare |
| Ozark | 21,953 | $69,372 | $230,600 | Compare |
| Warrensburg | 19,437 | $57,232 | $216,900 | Compare |
| Republic | 19,233 | $64,364 | $190,300 | Compare |
| Creve Coeur | 18,643 | $119,454 | $566,100 | Compare |
Demographics
Racial & Ethnic Composition
Economy & Education
Housing
Other Cities in Missouri
Data source: US Census Bureau ACS 5-Year Estimates. Last updated: 2026-04-05.
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Frequently Asked Questions about Arnold
What is the population of Arnold, MO?
The population of Arnold, MO is 20,884 according to the latest Census data.
What is the median household income in Arnold?
The median household income in Arnold, MO is $75,194 per year.
What is the median home value in Arnold?
The median home value in Arnold, MO is $209,700.
What is the average rent in Arnold?
The median monthly rent in Arnold, MO is $1,085.
What is the unemployment rate in Arnold?
The unemployment rate in Arnold, MO is 4.2%.