Arnold, Missouri

Arnold is a city in Jefferson County, Missouri, United States, and a suburb of St. Louis. The population was 20,858 at the 2020 United States census.

Arnold, Missouri
Arnold Water Tower from I-55 North
(color is sky blue since Nov 2015)
Location within Jefferson County and Missouri
Interactive map of Arnold
Coordinates: 38°25′47″N 90°22′24″W
CountryUnited States
StateMissouri
CountyJefferson
Government
  MayorRon Counts
  Mayor Pro-TemTim Seidenstricker
Area
  Total11.53 sq mi (29.86 km2)
  Land11.53 sq mi (29.85 km2)
  Water0.00 sq mi (0.01 km2)
Elevation
522 ft (159 m)
Population
 (2020)
  Total20,858
  Density1,809.80/sq mi (698.79/km2)
Time zoneUTC-6 (Central (CST))
  Summer (DST)UTC-5 (CDT)
ZIP code
63010
Area code636
FIPS code29-01972
GNIS ID2393991
Websitearnoldmo.org
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