City ZIP codes · Pennsylvania

West Mifflin, PA ZIP Codes

2 ZIP codes use the postal name West Mifflin, Pennsylvania (Census 2020 ZCTAs and GeoNames postal codes, October 2026), all residential. West Mifflin's most populous ZIP code is 15122, with 18,816 people (ACS 2020-2024); 98% of its land is in the city of West Mifflin.

ACS2020-24
Census2020
GeoNames2026

Where are West Mifflin's ZIP codes?

The 2 residential ZIP codes named West Mifflin, 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).

All 2 residential ZIP codes of West Mifflin

Residential ZIP codes with the postal name West Mifflin, PA, largest first (ACS 2020-2024); sort by any column
	County
15122	Allegheny County	18,816	1,455	$73k	$151k
15123	Allegheny County	2	29	–	–

Download the 2 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).

Which counties do West Mifflin's ZIP codes reach?

West Mifflin's residential ZIP codes lie in Allegheny County.

Which first three digits do West Mifflin'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 West Mifflin starts with 151.

Three-digit prefixes of West Mifflin'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 West Mifflin's
Prefix	Sectional center	Here	All codes
151	Pittsburgh, PA (SCF 150)	2	30

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