Nepenthes micramphora has only been recorded from the highland slopes of Mount Hamiguitan, Davao Oriental, in the extreme southeast of Mindanao island in the Philippines. Much of the surrounding region has not been explored for Nepenthes, and this species may therefore be present in other parts of southern Mindanao. Its altitudinal distribution extends from 1100 m above sea level to the summit at 1635 m.