Chatsworth is a city in Sioux County, Iowa, United States. The population was 75 at the 2020 census. Chatsworth is located at 42°54′57″N 96°…Chatsworth is a city in Sioux County, Iowa, United States. The population was 75 at the 2020 census. Chatsworth is located at 42°54′57″N 96°30′58″W / 42.91583°N 96.51611°W. According to the United States Census Bureau, the city has a total area of 0.49 square miles, all land.