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.
As of the census of 2000, there were 6,260 people, 2,206 households, and 1,729 families residing in the town. The population density was 851.9 people per square mile (328.8/km²). There were 2,273 housing units at an average density of 309.3/sq mi (119.4/km²). The racial makeup of the town was 89.06% White, 0.19% African American, 0.96% Native American, 3.23% Asian, 0.18% Pacific Islander, 2.01% from other races, and 4.38% from two or more races. Hispanic or Latino of any race were 6.87% of the population.
There were 2,206 households out of which 39.1% had children under the age of 18 living with them, 62.3% were married couples living together, 11.1% had a female householder with no husband present, and 21.6% were non-families. 16.8% of all households were made up of individuals and 6.6% had someone living alone who was 65 years of age or older. The average household size was 2.82 and the average family size was 3.17.
In the town the population was spread out with 28.8% under the age of 18, 6.4% from 18 to 24, 27.6% from 25 to 44, 25.5% from 45 to 64, and 11.7% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 98.7 males. For every 100 females age 18 and over, there were 94.3 males.
The median income for a household in the town was $60,444, and the median income for a family was $64,837. Males had a median income of $50,458 versus $31,140 for females. The per capita income for the town was $30,384. About 2.5% of families and 3.4% of the population were below the poverty line, including 3.4% of those under age 18 and 0.4% of those age 65 or over.
Loomis takes its name from one the of town's pioneers, James Loomis. At one time, James Loomis was the whole town—saloon keeper, railroad agent, express agent, and postmaster. In the early part of the 20th century, Loomis was the second largest fruit-shipping station in Placer County.
Loomis remained part of unincorporated Placer County until December 17, 1984, when the Town of Loomis officially incorporated. The town was in danger of being annexed by its neighbor Rocklin and the residents voted to incorporate to preserve local control, partly on the issue of preserving the "small town" character and historic structures such as the High Hand and Blue Goose fruit packing sheds which sit between Taylor Road (a segment of historic Highway 40) and the Union Pacific Railroad tracks.