Westfield is a city in Plymouth County, Iowa, United States. The population was 123 at the time of the 2020 census. It is the westernmost point in Iowa, this being due to a bend in the Big Sioux River. The nearby Broken Kettle wildlife refuge is one of the few places in Iowa where prairie rattlesnakes are commonly found.
Geography
According to the United States Census Bureau, the city has a total area of , all land.