Underwood is an unincorporated community in Skamania County, Washington. The latitude is 45.73 and the longitude is 121.526. Located above WA State Route 14, the 20 square mile community with approximately 1,053 residents is nestled on the side of Underwood Mountain (2,755 feet elevation) which rises between the Little White Salmon River and the White Salmon River. The Underwood Community Center includes a gym, playground with picnic tables, outdoor basketball and tennis courts, horse riding paddock, planned community gardens, with a nearby post office (ZIP 98651) and a recently built fire station.