18104 is zip code located in Allentown, Pennsylvania. The population is 43,396, making 18104 the 3rd largest zipcode in Allentown and the 3rd largest in Lehigh County.
There are 9 public schools in 18104 with an average Homefacts rating of B-. The total crime rate for Allentown is moderate , and there are 0 registered sex offenders residing in the zip code 18104. Unemployment in 18104 is high.