Pocahontas County is a county located in Iowa, United States. As of the 2020 census the population was 7,078, making it the state's ninth-least populous county. The county seat is Pocahontas. The county was formed in 1851.

Iowa Highway 3 (Iowa 3) is a state highway that runs from east to west across the state of Iowa. It is the longest state highway in Iowa, at 323 miles (520 km) long. Iowa 3 begins at the South Dakota state line where it continues as South Dakota Highway 50 and ends at the Northwest Arterial at the Dubuque city limits. It is designated the American Veterans Memorial Highway for its entirety. It is located approximately halfway between Interstate 80 and Interstate 90.