New Vienna is a city in Dubuque County, Iowa, United States.[4] According to the United States Census Bureau, the city has a total area of 0.44 square miles (1.14 km2), all land.This church is notable for its late 19th century William Schuelke pipe organ.There were 178 housing units at an average density of 381.9 per square mile (147.5/km2).There were 180 housing units at an average density of 409.1 per square mile (158.0/km2).The racial makeup of the city was 98.8% White, 0.2% African American, 0.7% Asian, and 0.2% from two or more races.30.1% of all households were made up of individuals, and 16.1% had someone living alone who was 65 years of age or older.25.7% of all households were made up of individuals, and 15.6% had someone living alone who was 65 years of age or older.