Washington Township is served by Pennsylvania Route 873, which crosses north-to-south from Pennsylvania Route 248 in Lehigh Gap to PA 329 in Neffs and PA 309 in Schnecksville. An important east-to-west thoroughfare is Mountain Road, which proceeds west from PA 873 in Lehigh Gap to PA 309 north of New Tripoli. LANta serves the township with bus route 325.