Stanfordville, NY is roughly halfway between Somers and Troy
A city that is roughly halfway between Oceanside, NY, and Philadelphia, PA, is Trenton, NJ. Trenton is located along the Delaware River and serves as the capital of New Jersey. It offers convenient access for travelers between these two locations and is known for its historical significance and government buildings.
You'll end up passing Trenton, NJ and Poughkeepsie. Mahwah, NJ is halfway.
Harmon, NY is halfway between Bronx & Fishkill
Saugerties, NY
The halfway point between Lewistown, PA and Albany, NY is Youngmann Memorial Hwy, Buffalo, NY 14228.
Southfields, NY
The halfway point is somewhere around Milepost 52 on I-88, just west of Oneonta, NY.
It is 2,895 miles according to Google Maps.
Fishkill, New York is halfway between Ossining & Rhinebeck
Poughkeepsie, NY
Belle Terre, NY