Hawarden is a city in Sioux County, Iowa, United States. The population was 2,478 at the 2000 census. It is located on the Big Sioux River.
Hawarden is located at 43°0′4″N 96°29′4″W / 43.00111°N 96.48444°W / 43.00111; -96.48444 (43.001145, -96.484541), along the Big Sioux River.
According to the United States Census Bureau, the city has a total area of 3.0 square miles (7.8 km²), of which, 2.9 square miles (7.5 km²) of it is land and 0.1 square miles (0.3 km²) of it (4.32%) is water.