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/16003

16003

ZIP 16003 is in Butler, Pennsylvania, in Butler County; area codes 724, 878 and 412; Eastern time. Butler has 3 ZIP codes; the others are 16001 and 16002.

Type
No street area
Time zone
America/New_York
County
Butler
Metro area
Pittsburgh, PA
Coordinates
40.8612, -79.8953

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 16001, whose figures describe that area — not this ZIP code.

☼ Live from 16003 — Butler, PA

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Where 16003 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 16003
  • 🔢 Type 16003 into a pocket calculator and turn it upside down: EOOgI — not quite a word, sorry.
  • ➕ As a number, 16,003 = 13 × 1231. Its digits add up to 10, a total 513 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 11111010000011
  • 🏠 Its numerical neighbours: 16002 (Butler, PA, 4 mi away) and 16016 (Boyers, PA, 17 mi away).
  • 🔄 Backwards, 16003 becomes 30061 — and that is a real ZIP code: Marietta, GA, 543 miles away.
  • 👥 32 other ZIP codes are made of exactly the same digits (00613, 00631, 01036, 01063, 01360, 01603, …). The farthest-flung twin is 00631 in Castaner, PR, 1,748 miles away.
  • 🧭 Farther north than 65% of all ZIP codes, and farther east than 74%.
  • 🎯985 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 16003 and you would come out at 40.86°S, 100.10°E — 1,068 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 07m of daylight. Shortest: 9h 14m.
🌙 The sky over 16003 today
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Source: USGS.

Business and tax activity

Business establishments16This ZIP16
Employees1,364This ZIP1,364
Annual payroll$138,083,000This ZIP$138,083,000

Land area

ZIP codes near 16003

ZIPCityDistance
16045 Lyndora, PA 1.2 mi
16029 East Butler, PA 2.9 mi
16002 Butler, PA 3.8 mi
16001 Butler, PA 4.3 mi
16017 Boyers, PA 4.5 mi
16018 Boyers, PA 4.5 mi
16039 Herman, PA 4.9 mi
16053 Renfrew, PA 5.7 mi
16027 Connoquenessing, PA 6.9 mi
16025 Chicora, PA 8.5 mi

Find every ZIP code within 10 miles of 16003 →

Questions about this ZIP code

Where is ZIP code 16003?

16003 is in Butler, Pennsylvania, in Butler County, part of the Pittsburgh, PA metropolitan area. Its published point location is 40.8612, -79.8953.

What county is 16003 in?

16003 lies in Butler County.

What area code is 16003?

Butler uses area codes 724, 878 and 412, from NANPA's telephone records.

What time zone is 16003 in?

16003 uses America/New_York.

What ZIP codes are near 16003?

The closest are 16045 (1.2 mi), 16029 (2.9 mi), 16002 (3.8 mi), 16001 (4.3 mi) and 16017 (4.5 mi).

Is 16003 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. “16003 ZIP Code — Butler, Pennsylvania (Butler County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/16003

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/16003.json

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