156421 Zip May 2026

If you are looking for information about the 5-digit ZIP Code , 15642 ZIP Code: Irwin, PA

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

Most students in this ZIP Code attend the Norwin School District . Demographics & Economy If you are looking for information about the

A mix of historic borough residential areas and suburban developments. Demographics & Economy A mix of historic borough

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 .

15642 is a valid ZIP Code for , and areas in Westmoreland County . However, 156421 is a 6-digit number and does not exist as a standard 5-digit United States ZIP Code.