Arnolds Park is a city in Dickinson County, Iowa, United States. The population was 1,110 in the 2020 census, a decline from the 1,162 population in the 2000 census.

Dickinson County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 17,703. The county seat is Spirit Lake. The county was organized in 1857 and is named in honor of Daniel S. Dickinson, a U.S. Senator for New York.