Galva is a city in Ida County, Iowa, United States. The population was 435 at the time of the 2020 census. Galva was named after Galva, Illinois…Galva is a city in Ida County, Iowa, United States. The population was 435 at the time of the 2020 census. Galva was named after Galva, Illinois, the former hometown of a large share of its early settlers.