Find the last 4 digits (ZIP+4) for an address in 18101

ZIP 18101, Allentown, PA is filled in. Just type the street address.

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ZIP Code 18101 – Allentown, PA

Allentown, Pennsylvania · Lehigh County · Eastern time

ZIP code18101
CityAllentown
StatePennsylvania
CountyLehigh County
Population6,120
Time zoneEastern · local time
ZIP typeStandard (has a Census ZCTA area)
Land area0.31 sq mi
Center (lat, long)40.6032, -75.4695

Area codes in this area

484610835

These are the area codes that most often serve ZIP 18101 (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

18102 Allentown · 0.5 mi18105 Allentown · 1.1 mi18103 Allentown · 2.5 mi18109 Allentown · 2.7 mi18032 Catasauqua · 3.7 mi18104 Allentown · 4.1 mi18052 Whitehall · 4.2 mi18018 Bethlehem · 4.2 mi

About ZIP 18101

ZIP code 18101 is assigned to Allentown, Pennsylvania. It lies in Lehigh County. Its Census area covers about 0.31 square miles of land. The closest neighboring ZIP is 18102 (Allentown), about 0.5 miles away.

Every address in 18101 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