Home > PA > Lehigh County > Allentown > Zip 18104

Zip Code 18104 — Allentown, PA

18104 is a ZIP Code associated with Allentown, PA, located within Lehigh. The postal region supports an estimated population of 48,683 residents across Data Pending housing units, with a population density of 819.0 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (40.611220, -75.546990)

Data MetricLocal Statistic
Postal / Zip Code18104
Primary CityAllentown
State / ProvincePA
CountyLehigh
Total Population48,683
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density819.0 people/sq mi
TimezoneAmerica/New_York

How 18104 Compares

MetricZIP 18104Lehigh CountyPA State Average
Population48,683386,38913,018,637
Median IncomeData PendingN/AN/A
Population Density819.0 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 18106Allentown3.6 mi6,226N/A
Zip 18102Allentown3.7 mi51,001N/A
Zip 18069Orefield3.8 mi8,515N/A
Zip 18052Whitehall3.9 mi29,451N/A
Zip 18101Allentown4.1 mi6,120N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →