18103 is zip code located in Allentown, Pennsylvania. The population is 48,021, making 18103 the 2nd largest zipcode in Allentown and the 2nd largest in Lehigh County.
There are 10 public schools in 18103 with an average Homefacts rating of C. The total crime rate for Allentown is moderate , and there are 5 registered sex offenders residing in the zip code 18103. Unemployment in 18103 is high.