 According to the United States Census Bureau, the Trout Lake CDP has a total area of , of which , or 0.61%, are water.The community sits in the Trout Lake Valley, drained to the southeast by Trout Lake Creek which flows to the White Salmon River, a south-flowing tributary of the Columbia River.As of the 2010 United States Census, there were 557 people, 224 households, and 171 families residing in the CDP.