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City ZIP codes · Pennsylvania

Allentown, PA ZIP Codes

8 ZIP codes use the postal name Allentown, Pennsylvania (Census 2020 ZCTAs and GeoNames postal codes, October 2026): 7 residential and 1 for PO boxes or a single organization. Median household income runs from $43,085 in 18102 to $94,601 in 18104, 2.2 times as much (Census Bureau, ACS 2020-2024). Allentown's most populous ZIP code is 18102, with 51,001 people (ACS 2020-2024); 99% of its land is in the city of Allentown.

  • ACS2020-24
  • Census2020
  • GeoNames2026

Where are Allentown's ZIP codes?

18101: $45k median household income18102: $43k median household income18103: $73k median household income18104: $95k median household income18106: $93k median household income18109: $58k median household income18195: – median household income18104181031810618109181021810118101: $45k median household income18102: $43k median household income18103: $73k median household income18104: $95k median household income18106: $93k median household income18109: $58k median household income18195: – median household income181041810318106181091810218101: $45k median household income18102: $43k median household income18103: $73k median household income18104: $95k median household income18106: $93k median household income18109: $58k median household income18195: – median household income1810418103181061810918102
The 7 residential ZIP codes named Allentown, shaded by median household income in national fifths (ACS 2020-2024). Select a ZIP to open it. <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are Allentown's ZIP codes?

The highest median household income is in 18104 ($94,601), the lowest in 18102 ($43,085). Home values run from $163,400 in 18102 to $412,200 in 18106.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013, B25077, B01003).

All 7 residential ZIP codes of Allentown

Residential ZIP codes with the postal name Allentown, PA, largest first (ACS 2020-2024); sort by any column
County
18102 Lehigh County 51,001 17,103 $43k $163k
18103 Lehigh County 48,746 2,841 $73k $273k
18104 Lehigh County 48,683 2,121 $95k $336k
18109 Lehigh County 18,446 2,236 $58k $199k
18106 Lehigh County 6,226 782 $93k $412k
18101 Lehigh County 6,120 19,935 $45k $171k
18195 Lehigh County no residents 0 – –

Download the 8 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; 2023 Gazetteer land areas (2020 ZCTAs); town names from simplemaps US ZIP Codes (CC BY 4.0) and GeoNames (CC BY 4.0).

PO Box and single-organization ZIP codes in Allentown

1 ZIP code named Allentown has no residential delivery area: post office boxes, or one organization (a large employer, an agency, a university) with its own code. The Census Bureau publishes no figures for them.

Allentown, PA: ZIP codes without a residential area, for PO boxes or one organization (GeoNames postal codes; USPS does not publish openly which is which)
ZIPCounty
18105Lehigh County

Source: GeoNames postal codes (CC BY 4.0); a ZIP code with no Census ZCTA has no residential delivery area.

Which counties do Allentown's ZIP codes reach?

Allentown's residential ZIP codes lie in 2 counties: Lehigh County (7 ZIP codes mainly there), Northampton County (part of a ZIP code).

Which places do Allentown's ZIP codes cover?

A postal name is not a city limit. By the Census Bureau's places, Allentown's residential ZIP codes cover Allentown itself and 3 other places, each listed with the ZIP codes that have at least 5% of their land in it or hold most of the place:

  • Wescosville census-designated 18103, 18106
  • Cetronia census-designated 18104
  • Dorneyville census-designated 18103

Source: U.S. Census Bureau, 2020 ZCTA-to-place relationship file (shares of land).

Which first three digits do Allentown's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Allentown starts with 181.

Three-digit prefixes of Allentown's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Allentown's
PrefixSectional centerHereAll codes
181 Lehigh Valley, PA (SCF 180) 8 8

All 8 ZIP codes that start with 181 are Allentown's: 7 residential codes and 1 PO Box or unique code, sorted at Lehigh Valley, PA (SCF 180).

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.