Zip Code 18101 — Allentown, PA

ZIP Code 18101 is associated with Allentown, PA, in Lehigh County. The listed population estimate is 6,120; estimated density is 7,694.6 people per square mile. Among records with population estimates, it ranks #18 of 27 in Lehigh County and #572 of 1,811 in PA.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (40.603010, -75.469800)

Data MetricLocal Statistic
Postal / Zip Code18101
Primary CityAllentown
State / ProvincePA
CountyLehigh
Total Population6,120
Population Density7,694.6 people/sq mi
TimezoneAmerica/New_York

How 18101 Compares

MetricZIP 18101Lehigh County recordsPA records
Population estimate6,120386,389 (sum)13,018,637 (sum)
Population Density7,694.6 /sq mi----
County population rank#18 of 27----
State population rank#572 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 18102Allentown0.5 mi51,001
ZIP 18103Allentown2.2 mi48,746
ZIP 18109Allentown2.8 mi18,446
ZIP 18032Catasauqua3.7 mi9,555
ZIP 18104Allentown4.1 mi48,683

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 →