Idaville is a census-designated place and unincorporated community in Tillamook County, Oregon, United States. As of the 2020 census, Idaville had a population of 374.
It was founded around the year 1870 by Warren N. Vaughn and named for his daughter Ida. The post office was established in 1922 and closed five years later, in 1927.
It is in the Tillamook School District 9.
The county is in the Tillamook Bay Community College district.