Fernville is a census-designated place (CDP) in Columbia County, Pennsylvania, United States.

[5] As of the census[7] of 2000, there were 488 people, approximately 196 households, and 149 families residing in the CDP.

There were 209 housing units at an average density of 256.8 per square mile (99.2/km2).

There were 196 households, out of which 30.6% had children under the age of 18 living with them, 66.8% were married couples living together, 6.1% had a female householder with no husband present, and 23.5% were non-families.

20.9% of all households were made up of individuals, and 10.2% had someone living alone who was 65 years of age or older.