Arnold
A city in Jefferson County, Missouri — population 21,145 as of 2020.
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Extreme Heat Warning — Extreme Heat Warning issued August 12 at 1:45AM CDT until August 13 at 8:00PM CDT by NWS St Louis MO
Overnight
78°F
Partly Cloudy1% precip
Wednesday
97°F
Mostly Sunny14% precip
Wednesday Night
76°F
Chance Showers And Thunderstorms29% precip
Thursday
97°F
Mostly Sunny14% precip
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Arnold by the numbers
Population
21,145Population figure, 2020
Households & income
- Area
- 11.52 sq mi (29.85 km²), 0 sq mi water
- Median age
- 39.7
- Households
- 8,394
- Persons per household
- 2.5
- Median household income
- $78,370
- Median house value
- $220,000
Municipal office
- Office
- FINANCE DIRECTOR
- Address
- 2101 JEFFCO BLVD, ARNOLD, MO 63010