Find the last 4 digits (ZIP+4) for an address in 18104

ZIP 18104, Allentown, PA is filled in. Just type the street address.

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ZIP Code 18104 – Allentown, PA

Allentown, Pennsylvania · Lehigh County · Eastern time

ZIP code18104
CityAllentown
StatePennsylvania
CountyLehigh County
Population48,683
Time zoneEastern · local time
ZIP typeStandard (has a Census ZCTA area)
Land area22.95 sq mi
Center (lat, long)40.6117, -75.5469

Area codes in this area

484610835

These are the area codes that most often serve ZIP 18104 (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

18105 Allentown · 3 mi18106 Allentown · 3.4 mi18069 Orefield · 3.7 mi18102 Allentown · 3.7 mi18052 Whitehall · 3.9 mi18101 Allentown · 4.1 mi18103 Allentown · 4.2 mi18046 East Texas · 4.4 mi

About ZIP 18104

ZIP code 18104 is assigned to Allentown, Pennsylvania. It lies in Lehigh County. Its Census area covers about 22.95 square miles of land. The closest neighboring ZIP is 18105 (Allentown), about 3 miles away.

Every address in 18104 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