Find the last 4 digits (ZIP+4) for an address in 18103

ZIP 18103, Allentown, PA is filled in. Just type the street address.

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ZIP Code 18103 – Allentown, PA

Allentown, Pennsylvania · Lehigh County · Eastern time

ZIP code18103
CityAllentown
StatePennsylvania
CountyLehigh County
Population48,746
Time zoneEastern · local time
ZIP typeStandard (has a Census ZCTA area)
Land area17.16 sq mi
Center (lat, long)40.5703, -75.4889

Area codes in this area

484610835

These are the area codes that most often serve ZIP 18103 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

18098 Emmaus · 2.2 mi18099 Emmaus · 2.2 mi18101 Allentown · 2.5 mi18105 Allentown · 2.6 mi18102 Allentown · 2.7 mi18049 Emmaus · 3.3 mi18106 Allentown · 4 mi18046 East Texas · 4 mi

About ZIP 18103

ZIP code 18103 is assigned to Allentown, Pennsylvania. It lies in Lehigh County. Its Census area covers about 17.16 square miles of land. The closest neighboring ZIP is 18098 (Emmaus), about 2.2 miles away.

Every address in 18103 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources