Laurel is a city in Marshall County, Iowa, United States. The population was 220 at the time of the 2020 census. Laurel was platted in 1880 b…Laurel is a city in Marshall County, Iowa, United States. The population was 220 at the time of the 2020 census. Laurel was platted in 1880 by Conrad Weissenburger, and it was incorporated in 1902. The city was named after Laurel, Ohio, by settler Rufus Archerd.