Zip Code 18104 — Allentown, PA

ZIP Code 18104 is associated with Allentown, PA, in Lehigh County. The listed population estimate is 48,683; estimated density is 819.0 people per square mile. Among records with population estimates, it ranks #3 of 27 in Lehigh County and #27 of 1,811 in PA.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (40.611220, -75.546990)

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

How 18104 Compares

MetricZIP 18104Lehigh County recordsPA records
Population estimate48,683386,389 (sum)13,018,637 (sum)
Population Density819.0 /sq mi----
County population rank#3 of 27----
State population rank#27 of 1,811----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in PA

ZIP CodeCityDistancePopulation estimate
ZIP 18106Allentown3.6 mi6,226
ZIP 18102Allentown3.7 mi51,001
ZIP 18069Orefield3.8 mi8,515
ZIP 18052Whitehall3.9 mi29,451
ZIP 18101Allentown4.1 mi6,120

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 →