Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — ZIP/15231

15231

ZIP 15231 is in Pittsburgh, Pennsylvania, in Allegheny County; area codes 412 and 878; Eastern time. Pittsburgh has 75 ZIP codes in all.

Type
No street area
Time zone
America/New_York
County
Allegheny
Metro area
Pittsburgh, PA
Coordinates
40.4961, -80.2466

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 15108, whose figures describe that area — not this ZIP code.

☼ Live from 15231 — Pittsburgh, PA

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Where 15231 is

This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 15231
  • 🔢 Type 15231 into a pocket calculator and turn it upside down: IEZSI — not quite a word, sorry.
  • ➕ As a number, 15,231 = 3 × 5077. Its digits add up to 12, a total 940 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 11101101111111
  • 🏠 Its numerical neighbours: 15230 (Pittsburgh, PA, 12 mi away) and 15232 (Pittsburgh, PA, 17 mi away).
  • 🔄 Backwards, 15231 becomes 13251 — and that is a real ZIP code: Syracuse, NY, 272 miles away.
  • 👥 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, 817 miles away.
  • 🧭 Farther north than 61% of all ZIP codes, and farther east than 73%.
  • 🎯967 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 15231 and you would come out at 40.50°S, 99.75°E — 1,072 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 04m of daylight. Shortest: 9h 16m.
🌙 The sky over 15231 today
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🌋 Shake report
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Source: USGS.

Business and tax activity

Business establishments91This ZIP91
Employees3,200This ZIP3,200
Annual payroll$189,476,000This ZIP$189,476,000

Land area

ZIP codes near 15231

ZIPCityDistance
15108 Coraopolis, PA 2.4 mi
15126 Imperial, PA 3.3 mi
15046 Crescent, PA 4.2 mi
15275 Pittsburgh, PA 4.5 mi
15056 Leetsdale, PA 5.0 mi
15081 South Heights, PA 5.5 mi
15026 Clinton, PA 5.9 mi
15071 Oakdale, PA 6.4 mi
15225 Pittsburgh, PA 7.0 mi
15143 Sewickley, PA 7.2 mi

Find every ZIP code within 10 miles of 15231 →

Questions about this ZIP code

Where is ZIP code 15231?

15231 is in Pittsburgh, Pennsylvania, in Allegheny County, part of the Pittsburgh, PA metropolitan area. Its published point location is 40.4961, -80.2466.

What county is 15231 in?

15231 lies in Allegheny County.

What area code is 15231?

Pittsburgh uses area codes 412 and 878, from NANPA's telephone records.

What time zone is 15231 in?

15231 uses America/New_York.

What ZIP codes are near 15231?

The closest are 15108 (2.4 mi), 15126 (3.3 mi), 15046 (4.2 mi), 15275 (4.5 mi) and 15056 (5 mi).

Is 15231 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

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Cite this page

zipcodes.pro. “15231 ZIP Code — Pittsburgh, Pennsylvania (Allegheny County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/15231

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