Nashua is a city in Chickasaw and Floyd counties in the U.S. state of Iowa. As of the 2000 census, the city population was 1,618. The famed Little Brown Church featured in the song "The Church in the Wildwood" is located in Nashua.
Nashua is located at 42°57′8″N 92°32′17″W / 42.95222°N 92.53806°W / 42.95222; -92.53806 (42.952231, -92.537944).
According to the United States Census Bureau, the city has a total area of 2.6 square miles (6.8 km²), of which, 2.5 square miles (6.4 km²) of it is land and 0.2 square miles (0.4 km²) of it (6.46%) is water.