Home > PA > Lehigh County > Allentown > Zip 18109

Zip Code 18109 — Allentown, PA

18109 is a ZIP Code associated with Allentown, PA, located within Lehigh. The postal region supports an estimated population of 18,446 residents across Data Pending housing units, with a population density of 863.5 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (40.636730, -75.440430)

Data MetricLocal Statistic
Postal / Zip Code18109
Primary CityAllentown
State / ProvincePA
CountyLehigh
Total Population18,446
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density863.5 people/sq mi
TimezoneAmerica/New_York

How 18109 Compares

MetricZIP 18109Lehigh CountyPA State Average
Population18,446386,38913,018,637
Median IncomeData PendingN/AN/A
Population Density863.5 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 18032Catasauqua2.0 mi9,555N/A
Zip 18018Bethlehem2.4 mi32,965N/A
Zip 18102Allentown2.7 mi51,001N/A
Zip 18101Allentown2.8 mi6,120N/A
Zip 18017Bethlehem3.2 mi40,640N/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 →