Arnold Township, Jefferson County, Missouri
Arnold Township is a township in Jefferson County, Missouri. About 20,956 people live there (2020–2024 estimate). It covers 11.5 sq mi (29.8 km²) of land and uses Central Time. It is a legal area with no government of its own.
- Population, 2020–2024 estimate
- 20,956 ± 52
- County
- Jefferson County
- School district
- Fox C-6 School District
- Land area
- 11.5 sq mi (29.8 km²)
- Type
- TownshipNo government of its own
- Time zone
- Central TimeUTC-06:00 in January; UTC-05:00 in July
- Median household income
- $78,370 ± $6,883
- Median home value
- $220,000 ± $8,959
- Water area
- 0 sq mi (0.01 km²)
- State
- Missouri
- Census code (GEOID)
- 2909901975
- Coordinates (central point)
- 38.426009, -90.369312
These coordinates mark a central point for the area, not a street address. Population, income and home value: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 20, 2026.
Census place in Arnold Township
- Arnold (city)20,956 people
This place’s central point lies inside Arnold Township. A place can reach across the line, and its government, if it has one, can be separate from the township’s.
Bordering areas, nearest first
- Windsor Township2.2 mi southwest
- Oakville Township, St. Louis County3.3 mi northeast
- Tesson Ferry Township, St. Louis County4.7 mi north
These towns, townships, cities and boroughs share a boundary with Arnold Township. Distances are straight lines between central points, not driving distances.
Other townships in Jefferson County, largest first
- Rock Township34,422 people
- Imperial Township24,351 people
- Windsor Township22,366 people
- Joachim Township21,970 people
- Meramec Township19,708 people
- River View Township18,656 people
- High Ridge Township18,327 people
- Valle Township15,829 people
- Central Township14,773 people
- Plattin Township11,820 people
- Big River Township6,280 people
People counts are American Community Survey 2020–2024 5-year estimates. See Jefferson County for its cities, ZIP Code areas and county seat.
Sunrise and sunset in Arnold Township
- Longest day
- 14 hours 51 minutes around June 21
- Shortest day
- 9 hours 30 minutes around December 21
- Earliest sunrise
- 5:37 AM around June 14
- Latest sunrise
- 7:33 AM the day before clocks go back in November
- Earliest sunset
- 4:40 PM around December 7
- Latest sunset
- 8:29 PM around June 28
Clocks go forward an hour on the second Sunday in March and back on the first Sunday in November, so sunrise and sunset jump an hour later in March and an hour earlier in November.
| Day | Sunrise | Sunset | Daylight |
|---|---|---|---|
| Jan 15 | 7:17 AM | 5:04 PM | 9 h 47 min |
| Feb 15 | 6:52 AM | 5:39 PM | 10 h 47 min |
| Mar 15 | 7:12 AM | 7:08 PM | 11 h 56 min |
| Apr 15 | 6:25 AM | 7:37 PM | 13 h 12 min |
| May 15 | 5:50 AM | 8:05 PM | 14 h 15 min |
| Jun 15 | 5:37 AM | 8:27 PM | 14 h 50 min |
| Jul 15 | 5:49 AM | 8:24 PM | 14 h 35 min |
| Aug 15 | 6:15 AM | 7:55 PM | 13 h 40 min |
| Sep 15 | 6:42 AM | 7:09 PM | 12 h 27 min |
| Oct 15 | 7:10 AM | 6:23 PM | 11 h 13 min |
| Nov 15 | 6:42 AM | 4:48 PM | 10 h 6 min |
| Dec 15 | 7:11 AM | 4:41 PM | 9 h 30 min |
Approximate times for a flat horizon at the central point; the days move by a day or so from year to year. Hills and weather can change what you see.
Before using this answer on a form
A township line is not always the line on your mail: a mailing address can name another town or post office, and school districts, ZIP Codes and tax districts follow their own lines. For taxes, voting or permits, check the full address with Jefferson County or the local office.
Find the township or town where you are now or find your county.