Browse the top real estate properties in Allentown, Pennsylvania with Property Profile Report. The average listing price of homes in Allentown is $508,980, where the economy and housing-markets are flourishing! Get started by selecting a Zip code above. The most popular zip codes in Allentown, PA are: 18102, 18103, 18104, 18109, 18106 with a median listing price of $508,980.