18109 is zip code located in Allentown, Pennsylvania. The population is 16,274, making 18109 the 4th largest zipcode in Allentown and the 10th largest in Lehigh County.
There are 0 public schools in 18109 with an average Homefacts rating of D. The total crime rate for Allentown is moderate , and there are 0 registered sex offenders residing in the zip code 18109. Unemployment in 18109 is high.