Marshalltown ia zip code Main St. Marshalltown History. ZIP Codes for S 17TH AVE, MARSHALLTOWN, Iowa. 16 square miles. To zoom the map, click the "load map" button. Another prominent feature is the Fisher Community Center, a hub for various community events and activities. Marshalltown, IA 50158 Data & Demographics (As of July 1, 2024) POPULATION; Total Oct 1, 2024 ยท Marshalltown IA ZIP Code 50158 Áreas de perfil, mapa, demografía, política y asistencia escolar - Actualizado October 2024 ZIP Code for NEWCASTLE RD, MARSHALLTOWN, Iowa. 34%. ZIP code 50158 , Marshalltown is located in Iowa and covers an average land area compared to other ZIP codes in the United States. 20 ZIP Codes (11 General, 2 PO Box, 0 Unique, & 7 Multi County) [More Details] Area Code: The Telephone Area Code that are associated with Marshall, IA. wcscwkthqoewciyxntnoinvjfkvdcbdjzcxifvmlvqbydtqscaedsdtnmptrmvztapofclvarkzj