Trooper Greg Agosti says the fire started at 5:15 a.m. in a garage on the property of 76-year-old Hazel Courson of Brockport, and then spread to the home a few feet away.
Courson, along with 48-year-old Lori Hollobaugh, 29-year-old April Dutka and 30-year-old Jason Young were asleep at the time of the fire but were able to escape without being hurt.
Agosti says radiant heat from the garage fire also damaged another house occupied by Alan and Mary Moore.
Damage is estimated at $150,000.
The Horton Township Fire Department was assisted by Fox Township, Brockway, Ridgway, Falls Creek and DuBois fire departments. The American Red Cross is assisting the victims.