15642 is zip code located in Irwin, Pennsylvania. The population is 45,361, making 15642 the largest zipcode in Irwin and the 2nd largest in Westmoreland County.
There are 3 public schools in 15642 with an average Homefacts rating of A-. , and there are 13 registered sex offenders residing in the zip code 15642. Unemployment in 15642 is very high.