Rosalia was the site of an 1858 Battle of Pine Creek between United States troops, including Nez Perce allies, under Brevet Lieutenant Colonel Edward Steptoe, and members of the Coeur d'Alene, Palus and Spokane Native American tribes. Landmarks include Steptoe Battlefield State Park Heritage Site and Central Service Station. Rosalia is the birthplace of Ralph J. Roberts, geologist and mineralogist.
- CountyWhitman County
- Population598 (2020 U.S. Census)
- Historic places2 on the National Register




























Central Service Station
Steptoe Battlefield State Park Heritage Site
Battle of Pine Creek