As of the census of 2000, there were 400 people, 141 households, and 104 families residing in the CDP. The population density was 3.1 people per square mile (1.2Square kilometers). There were 181 housing units at an average density of 1.4Square meters(0.5Square kilometers). Alta is a census-designated place (CDP) in Teton County, Wyoming, United States. The population was 400 at the 2000 census. It is part of the Jackson, WYID Micropolitan Statistical Area. According to the United States Census Bureau, the CDP has a total area of 130.1square miles (337.0Square kilometers), of which, 130.0square miles (336.8Square kilometers) of it is land and 0.1square miles (0.2Square kilometer) of it (0.07%) is water.