Arnold

Also known as Arnold, Missouri, Arnold, MO

city in Jefferson County, Missouri, United States

Key facts

Country: United States
State: Missouri
County: Jefferson
Type: Mayor-Administrator-Council
Mayor: William Moritz
Administrator: Anthony Traxler
Total: 11.53 sq mi (29.86 km )
Land: 11.53 sq mi (29.85 km )
Water: 0.0039 sq mi (0.01 km )
Elevation: 522 ft (159 m)
Density: 1,809.9/sq mi (698.79/km )
Time zone: UTC-6 ( Central (CST) )
Summer dst

Article

Arnold is a city in northeastern Jefferson County, Missouri, situated near the confluence of the Meramec and Mississippi rivers. A suburb of St. Louis, the city lies within the Greater St. Louis metropolitan statistical area. The population was 20,858 at the 2020 United States census, which makes it the most populous community in the county.

History