to
Update
is a city in and the county seat of Buchanan County, Iowa, United States. The population was 6,014 at the 2000 census.
According to the United States Census Bureau, the city has a total area of 3.8 square miles (9.9 km²), of which, 3.7 square miles (9.6 km²) of it is land and 0.1 square miles (0.3 km²) of it (3.39%) is water.