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The township's numbered roads include north-to-south Routes 145 and 873 and east-to-west Routes 248 and 946.
Pennsylvania Route 873 begins at PA 309 in Schnecksville and exits the area to the north towards Neffs.
Washington Township is served by PA 873, which crosses north-to-south from PA 248 in Lehigh Gap to PA 329 in Neffs and PA 309 in Schnecksville.