De Lamar, Idaho, human settlement in Owyhee County, Idaho, United States of America

De Lamar is a mining settlement in Owyhee County, Idaho, now a ghost town situated at high elevation near Silver City. Only a handful of buildings remain standing across roughly 650 hectares of abandoned mines, old foundations, and ruins spread across the landscape.

The settlement was established in the late 1880s when Joseph Raphael De Lamar, a former ship captain, discovered silver deposits and started mining operations. The mine produced significant wealth for a brief period before declining around 1890, leading to the town's gradual abandonment.

The town took its name from the De Lamar Mine, named for mining magnate and former sea captain Joseph Raphael De Lamar, who established it in 1888. The community's post office operated only in summer from 1917 to 1930, a sign that a few residents stayed on long after the boom ended.

De Lamar lies on land administered by the Bureau of Land Management, reached by an unpaved route about 6 miles (10 km) west of Silver City at an elevation of 5,463 ft (1,665 m). The historic district covers roughly 1,600 acres (650 ha), yet only four buildings remain intact enough to count as contributing properties, so expect scattered ruins rather than a streetscape.

The 1976 National Register historic district covers about 1,600 acres, yet only four buildings were sound enough to count as contributing properties. The listing came nearly half a century after the summer-only post office closed in 1930.