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City ZIP codes · Pennsylvania

Williamsport, PA ZIP Codes

4 ZIP codes use the postal name Williamsport, Pennsylvania (Census 2020 ZCTAs and GeoNames postal codes, October 2026): 2 residential and 2 for PO boxes or a single organization. Median household income runs from $53,237 in 17701 to $70,210 in 17702, 1.3 times as much (Census Bureau, ACS 2020-2024). Williamsport's most populous ZIP code is 17701, with 43,104 people (ACS 2020-2024); 9% of its land is in the city of Williamsport.

  • ACS2020-24
  • Census2020
  • GeoNames2026

Where are Williamsport's ZIP codes?

17701: $53k median household income17702: $70k median household income177011770217701: $53k median household income17702: $70k median household income177011770217701: $53k median household income17702: $70k median household income1770117702
The 2 residential ZIP codes named Williamsport, 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 Williamsport's ZIP codes?

The highest median household income is in 17702 ($70,210), the lowest in 17701 ($53,237). Home values run from $183,900 in 17701 to $196,900 in 17702.

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

All 2 residential ZIP codes of Williamsport

Residential ZIP codes with the postal name Williamsport, PA, largest first (ACS 2020-2024); sort by any column
County
17701 Lycoming County 43,104 440 $53k $184k
17702 Lycoming County 10,488 171 $70k $197k

Download the 4 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 Williamsport

2 ZIP codes named Williamsport have 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.

Williamsport, 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
17703Lycoming County
17705Lycoming County

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

Which counties do Williamsport's ZIP codes reach?

Williamsport's residential ZIP codes lie in 2 counties: Lycoming County (2 ZIP codes mainly there), Sullivan County (part of a ZIP code).

Which places do Williamsport's ZIP codes cover?

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

  • Duboistown 17702
  • Faxon census-designated 17701
  • Garden View census-designated 17701
  • Kenmar census-designated 17701
  • South Williamsport 17702

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

Which first three digits do Williamsport'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 Williamsport starts with 177.

Three-digit prefixes of Williamsport'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 Williamsport's
PrefixSectional centerHereAll codes
177 Harrisburg, PA (SCF 170) 4 44

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