Inwood is a city in Lyon County, Iowa, United States. The population was 928 at the time of the 2020 census. Inwood's longitude and latitude c…Inwood is a city in Lyon County, Iowa, United States. The population was 928 at the time of the 2020 census. Inwood's longitude and latitude coordinates in decimal form are 43.308770, -96.432531. According to the United States Census Bureau, the city has an area of 1.34 square miles, all land.