is a city in Bonneville County, Idaho, United States. As of the 2000 census the population of Ammon was 6,187, with an estimated 2006 population of 12,065.
Having nearly doubled in size since 2000, Ammon is among the fastest-growing cities in Idaho. It is part of the Idaho Falls, Idaho Metropolitan Statistical Area.
According to the United States Census Bureau, the city has a total area of 2.9 square miles (7.6 km²), all of it land.