15123
ZIP 15123 is in West Mifflin, Pennsylvania, in Allegheny County; area codes 412 and 878; Eastern time. West Mifflin has 2 ZIP codes; the other is 15122.
- Type
- Standard
- Time zone
- America/New_York
- County
- Allegheny
- Metro area
- Pittsburgh, PA
- Population
- 2
- Coordinates
- 40.3482, -79.9348
Weather right now
Asking the National Weather Service…
Where 15123 is
Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.
- 🔢 Type 15123 into a pocket calculator and turn it upside down: EZISI — not quite a word, sorry.
- ➕ As a number, 15,123 = 3 × 71 × 71. Its digits add up to 12, a total 940 other ZIP codes share.
- 💾In binary, the way a computer stores it:
11101100010011 - 🏠 Its numerical neighbours: 15122 (West Mifflin, PA, 2 mi away) and 15126 (Imperial, PA, 20 mi away).
- 🔄 Backwards, 15123 becomes 32151, which is not a ZIP code at all.
- 👥 29 other ZIP codes are made of exactly the same digits (11235, 11352, 12153, 12513, 12531, 13152, …). The farthest-flung twin is 51231 in Archer, IA, 836 miles away.
- 🧭 Farther north than 60% of all ZIP codes, and farther east than 74%.
- 🎯984 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 15123 and you would come out at 40.35°S, 100.07°E — 1,053 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 15h 03m of daylight. Shortest: 9h 17m.
- 📏 At 0.068 square miles of land, 15123 is bigger than 1% of ZIP codes — about 33 football fields.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 2This ZIP2 |
|---|---|
| Households | 0 |
| Housing units | 80This ZIP80 |
| Bachelor's degree or higher | 100.0%This ZIP100.0% |
| Population density | 29.4 / sq miThis ZIP29.4 / sq mi |
Business and tax activity
| Business establishments | 14This ZIP14 |
|---|---|
| Employees | 72This ZIP72 |
| Annual payroll | $3,331,000This ZIP$3,331,000 |
Land area
| Land area | 0.07 sq miThis ZIP0.07 sq mi |
|---|---|
| Water area | 0.00 sq mi |
Other place names in 15123
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 15123
| ZIP | City | Distance |
|---|---|---|
15236 | Pittsburgh, PA | 2.2 mi |
15122 | West Mifflin, PA | 2.3 mi |
15034 | Dravosburg, PA | 2.4 mi |
15227 | Pittsburgh, PA | 2.6 mi |
15045 | Glassport, PA | 3.0 mi |
15207 | Pittsburgh, PA | 3.5 mi |
15025 | Clairton, PA | 3.6 mi |
15120 | Homestead, PA | 3.6 mi |
15134 | Mckeesport, PA | 3.7 mi |
15133 | Mckeesport, PA | 3.9 mi |
Find every ZIP code within 10 miles of 15123 →
Questions about this ZIP code
Where is ZIP code 15123?
15123 is in West Mifflin, Pennsylvania, in Allegheny County, part of the Pittsburgh, PA metropolitan area. Its published point location is 40.3482, -79.9348.
What county is 15123 in?
15123 lies in Allegheny County.
What area code is 15123?
West Mifflin uses area codes 412 and 878, from NANPA's telephone records.
What time zone is 15123 in?
15123 uses America/New_York.
How many people live in 15123?
About 2 people live in ZIP code 15123, at 29.4 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.
What ZIP codes are near 15123?
The closest are 15236 (2.2 mi), 15122 (2.3 mi), 15034 (2.4 mi), 15227 (2.6 mi) and 15045 (3 mi).
Is 15123 a PO Box ZIP code?
15123 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “15123 ZIP Code — West Mifflin, Pennsylvania (Allegheny County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/15123
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/15123.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.