Colesville, Pennsylvania is a suburban village located on Route 378

Pennsylvania Route 378

Pennsylvania Route 378 is a north-to-south road in Lehigh and Northampton counties. Its northern terminus is at U.S. Route 22 in Bethlehem and the portion north of the Lehigh River is a freeway. The highway was once Interstate 378 but when Interstate 78 was rerouted from U.S...

 in Upper Saucon Township, Lehigh County and Lower Saucon Township, Northampton County. It is on the south side of Lehigh Mountain from Bethlehem. Interstate 78

Interstate 78

Interstate 78 is an Interstate Highway in the Northeast United States, running 144 miles from Interstate 81 northeast of Harrisburg, Pennsylvania, through Allentown, Pennsylvania, and western and northern New Jersey to the Holland Tunnel and Lower Manhattan in New York City.I-78 is a major road...

 passes through the village but does not interchange there. Colesville is split between the Bethlehem zip code

ZIP Code

ZIP codes are a system of postal codes used by the United States Postal Service since 1963. The term ZIP, an acronym for Zone Improvement Plan, is properly written in capital letters and was chosen to suggest that the mail travels more efficiently, and therefore more quickly, when senders use the...

 of 18015 and the Center Valley zip code of 18034. http://www.hipcodes.com/18034/