The Placer County Sheriff’s Office serves the people of Placer County by providing law enforcement to the unincorporated areas, from the Sacramento County line to the Nevada state line at Lake Tahoe, plus providing contract law enforcement services to the city of Colfax and the township of Loomis.

The South Placer Substation is located in Loomis and covers the area from Newcastle to Sacramento County line. The communities served by the substation include Newcastle, Ophir, Penryn, Loomis, Granite Bay, the West Roseville/Dry Creek area, Sunset Estates, Rural Lincoln and Sheridan.