Find the last 4 digits (ZIP+4) for an address in 18109

ZIP 18109, Allentown, PA is filled in. Just type the street address.

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ZIP Code 18109 – Allentown, PA

Allentown, Pennsylvania · Lehigh County · Eastern time

ZIP code18109
CityAllentown
StatePennsylvania
CountyLehigh CountyNorthampton County
Population18,446
Time zoneEastern · local time
ZIP typeStandard (has a Census ZCTA area)
Land area8.25 sq mi
Center (lat, long)40.6355, -75.4419

Area codes in this area

484610835

These are the area codes that most often serve ZIP 18109 (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

18032 Catasauqua · 2 mi18002 Lehigh Valley · 2.2 mi18018 Bethlehem · 2.5 mi18102 Allentown · 2.6 mi18101 Allentown · 2.7 mi18105 Allentown · 3.1 mi18017 Bethlehem · 3.3 mi18052 Whitehall · 3.6 mi

About ZIP 18109

ZIP code 18109 is assigned to Allentown, Pennsylvania. It crosses 2 counties; most of its land is in Lehigh County. Its Census area covers about 8.25 square miles of land. The closest neighboring ZIP is 18032 (Catasauqua), about 2 miles away.

Every address in 18109 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