156421 Zip -

: 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.

💡 : U.S. ZIP Codes are always 5 digits in their basic form; the expanded ZIP+4 system uses 9 digits . 156421 zip

A mix of historic borough residential areas and suburban developments. : A full 9-digit code like 15642-1XXX ,

Most students in this ZIP Code attend the Norwin School District . Demographics & Economy and light manufacturing

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 .