🇺🇸 United States ZIP Code

STANDARD

15122

West Mifflin

ZIP Code 15122 is a standard zip code serving West Mifflin, West Mifflin, Pennsylvania (PA), in Allegheny County, United States. It has an estimated population of 20,131 with a median household income of $45,685. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Pennsylvania (PA)
County: Allegheny
City: West Mifflin
Timezone: America/New_York

Coordinates

Latitude: 40.363400
Longitude: -79.866400

Geographic Details

Land Area: 12.61 mi²
Water Area: 0.21 mi²
Population Density: 1597.0 people per mi² (80th percentile)
Bounding Box: 40.402272°N, 40.319848°S, -79.846969°E, -79.956256°W

With 20,131 residents spread across 12.61 square miles, this area has a population density of 1597.0 people per square mile.

Demographics

20,131

Population

80th percentile

$45,685

Median Income

40th percentile

$85,200

Median Home Value

25th percentile

12.61 mi²

Land Area

The median household income in 15122 is $45,685, and the median home value is $85,200.

Housing

9,444

Total Units

8,773

Occupied Units

92.9%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in West Mifflin, PA.

15123

West Mifflin

Similar ZIP Codes in Pennsylvania

ZIP codes with similar median household income in Pennsylvania.

17813

Beavertown

$44,868

17744

Linden

$45,032

16748

Shinglehouse

$40,872

15216

Pittsburgh

$50,998

17109

Harrisburg

$50,411

18472

Waymart

$47,560

16112

Bessemer

$45,402

15767

Punxsutawney

$39,740

Frequently Asked Questions

What information is available for each ZIP code?

Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).

What are the different types of ZIP codes?

There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.

How often is ZIP code data updated?

ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.

What is population density and why does it matter?

Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.

How are ZIP code boundaries determined?

ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.

What does median household income tell me about a ZIP code?

Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.