Princeton is a census-designated place in Latah County, Idaho, United States. As of the 2020 census, Princeton had a population of 193.
Princeton is located on Idaho State Highway 6 east-southeast of Potlatch. Princeton has a post office with ZIP code 83857. As of the 2010 census, its population was 148.
A post office called Princeton has been in operation since 1894. The community was named after Princeton, Minnesota, the native home of an early settler.