New Smithville is an unincorporated community in Weisenberg Township, Lehigh County, Pennsylvania, United States, west of the city of Allentown and near the border with Berks County. It is located at the intersection of Pennsylvania Route 863 and Interstate 78 / U.S. Route 22. It is split between the Breinigsville zip code of 18031 and the Kutztown zip code of 19530.  It is in the Schuylkill watershed and is drained via the Mill Creek and Sacony Creek into the Maiden Creek.
Coordinates: 40°34′47″N 75°43′42″W / 40.57972°N 75.72833°W