Green Mountain is a rural unincorporated community in Marshall County, Iowa, United States. It is located in Marion Township.
The town of Green Mountain was established in 1883.
Green Mountain, Iowa was the site of the Green Mountain train wreck. The wreck is known as the worst ever in Iowa history, as 52 people were killed in the accident on March 21, 1910. To this day, Green Mountain is itself a train wreck.
Coordinates: 42°06′06″N 92°49′14″W / 42.10167°N 92.82056°W / 42.10167; -92.82056