 According to the United States Census Bureau, the CDP has a total area of , all of it land.Mountain Top is located in the saddle pass atop the drainage divide between the Susquehanna River basin (to the north and west) and the Lehigh River basin (to the east and south), so sits astride an important land communications corridor bridging the two watersheds below.It is just northwest of White Haven, at the head end of the Lehigh River, and in the heights above Hazleton, only south of Wilkes-Barre on Pennsylvania Route 309.