: A full 9-digit code like 15642-1XXX , where the "1" is the start of the four-digit extension used for more precise mail sorting.
Most students in this ZIP Code attend the Norwin School District . Demographics & Economy 156421 zip
Retail, healthcare, and light manufacturing, with many residents commuting to Pittsburgh for work. Potential Alternatives If "156421" was a typo, you might be looking for: 15642 : Irwin, PA (the most likely intent). 16421 : A ZIP Code in Erie County, PA . : A full 9-digit code like 15642-1XXX ,
Served by U.S. Route 30 and the Pennsylvania Turnpike (I-76), which has an exit in the area. and light manufacturing