Pierson is a city in Woodbury County, Iowa, United States. It is part of the Sioux City, Iowa–Nebraska–South Dakota Metropolitan Statistical Area. The population was 337 at the time of the 2020 census. Pierson was platted in 1883 with railroads and lumberyards being important to its growth. The city started with only eight blocks of land until new additions were later made. Pierson has a library, a school district, and five churches, among other businesses and recreation.