Friday The 13th Part 5 was filmed in California, on the outskirts of Los Angeles at a
small farm/orchard that contained a house and barn.
Three different sources have different towns listed for filming. Thousand Oaks, Ca. Oxnard, Ca. and Camarillo, Ca. All three locations are within 15 minutes of each other. Its entirely possible that all three locations were used for different scenes. It is unknown at this time where the house was located.