Loomis is an incorporated town in Placer County, California, United States. It is part of the Sacramento–Arden-Arcade–Roseville Metropolitan Statistical Area. The population was 6,260 at the 2000 census. It is home to Del Oro High School. Foundation elementary schools for Del Oro High School are Placer Elementary School, Franklin Elementary School, Loomis Grammar School, H. Clarke Powers Elementary School, Penryn School, Ophir School, Newcastle School, and the newly opened Loomis Basin Charter School.