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Zip Code 18603 — Berwick, PA

18603 is a ZIP Code associated with Berwick, PA, located within Columbia. The postal region supports an estimated population of 18,827 residents across Data Pending housing units, with a population density of 136.1 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (41.085060, -76.245910)

Data MetricLocal Statistic
Postal / Zip Code18603
Primary CityBerwick
State / ProvincePA
CountyColumbia
Total Population18,827
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density136.1 people/sq mi
TimezoneAmerica/New_York

How 18603 Compares

MetricZIP 18603Columbia CountyPA State Average
Population18,82772,58013,018,637
Median IncomeData PendingN/AN/A
Population Density136.1 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 18635Nescopeck4.4 mi3,734N/A
Zip 18631Mifflinville4.8 mi1,100N/A
Zip 17878Stillwater7.2 mi1,488N/A
Zip 18655Shickshinny7.3 mi6,018N/A
Zip 17859Orangeville8.1 mi2,701N/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 →