Arnold is located in Jefferson County, MO. The population is 20,909, making Arnold the largest city in Jefferson County.
There are 10 public schools in Arnold with an average Homefacts rating of A. The total crime rate for Arnold is very low , and there are 65 registered sex offenders residing in the city. Unemployment in Arnold is low and the median home sales price is $0. Detailed and up-to-date Arnold property reports are available for any property address.
Cities near Arnold include Arnold Township, Windsor Township and Oakville.