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 .

Served by U.S. Route 30 and the Pennsylvania Turnpike (I-76), which has an exit in the area. 156421 zip

A mix of historic borough residential areas and suburban developments.

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. : A full 9-digit code like 15642-1XXX ,

Approximately 33,000 residents as of recent census estimates.

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 . Served by U

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