Preston is a city in Franklin County, Idaho, United States. The population was 4,682 at the 2000 census. The city is the county seat of Franklin County. It is part of the Logan, Utah-Idaho Metropolitan Statistical Area.
The Bear River Massacre occurred in 1863 at a point a few miles northwest of Preston. The Bear River Massacre Site is a National Historic Landmark.
In 1866, Mormon pioneers arrived in the northern end of the Cache Valley, stretching across southeastern Idaho and northeastern Utah. They founded a community in that location and named it Worm Creek, but later changed it to Preston. Preston was named after Preston, England, the center of early Mormon proselytizing in the UK.