Pompeys Pillar (community), Montana

Pompeys Pillar is an unincorporated community located in Yellowstone County, Montana, United States. It is situated near the Pompeys Pillar National Monument, a sandstone rock formation bearing the only remaining physical evidence of the Lewis and Clark Expedition: William Clark's signature, dated July 25, 1806.

The community itself is primarily agricultural, with ranching and farming being significant economic activities. Its proximity to the national monument contributes to some tourism, though the community itself is relatively small and quiet. The population is not formally tracked as it's an unincorporated area, but estimates suggest a small number of residents.

The name "Pompeys Pillar" derives from William Clark's naming of the rock formation after Jean Baptiste Charbonneau, the young son of Sacagawea, whom Clark nicknamed "Pomp" or "Pompy." While the monument is a popular tourist destination managed by the Bureau of Land Management (BLM), the surrounding community retains a rural character reflective of Montana's agricultural heritage. The area offers scenic views of the Yellowstone River valley and the surrounding landscape.