Martelle, Iowa is a city in Jones County, Iowa, United States. The population was 249 at the time of the 2020 census. It is part of the C…Martelle, Iowa is a city in Jones County, Iowa, United States. The population was 249 at the time of the 2020 census. It is part of the Cedar Rapids Metropolitan Statistical Area. Martelle was platted in 1872 when the Chicago, Milwaukee, St. Paul and Pacific Railroad was being built through the neighborhood.