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/08541

08541

ZIP 08541 is in Princeton, New Jersey, in Mercer County; area codes 609 and 640; Eastern time. Princeton has 5 ZIP codes; the others are 08540, 08542, 08543 and 08544.

Type
No street area
Time zone
America/New_York
County
Mercer
Coordinates
40.3487, -74.6590

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 08544, whose figures describe that area — not this ZIP code.

☼ Live from 08541 — Princeton, NJ

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Where 08541 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 08541
  • 🔢 Type 08541 into a pocket calculator and turn it upside down: IhSBO — not quite a word, sorry.
  • ➕ As a number, 8,541 = 3 × 3 × 13 × 73. Its digits add up to 18, a total 2,332 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10000101011101
  • 🏠 Its numerical neighbours: 08540 (Princeton, NJ, 1 mi away) and 08542 (Princeton, NJ, 0 mi away).
  • 🔄 Backwards, 08541 becomes 14580 — and that is a real ZIP code: Webster, NY, 245 miles away.
  • 👥 59 other ZIP codes are made of exactly the same digits (01845, 01854, 04851, 05148, 05481, 05841, …). The farthest-flung twin is 85041 in Phoenix, AZ, 2,109 miles away.
  • 🧭 Farther north than 60% of all ZIP codes, and farther east than 88%.
  • 🎯1,261 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 08541 and you would come out at 40.35°S, 105.34°E — 824 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 03m of daylight. Shortest: 9h 17m.
🌙 The sky over 08541 today
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Source: USGS.

Business and tax activity

Business establishments5This ZIP5
Employees4,952This ZIP4,952
Annual payroll$318,301,000This ZIP$318,301,000

Land area

ZIP codes near 08541

ZIPCityDistance
08544 Princeton, NJ 0.2 mi
08542 Princeton, NJ 0.4 mi
08540 Princeton, NJ 1.1 mi
08528 Kingston, NJ 3.4 mi
08553 Rocky Hill, NJ 3.7 mi
08536 Plainsboro, NJ 4.0 mi
08504 Blawenburg, NJ 4.7 mi
08558 Skillman, NJ 5.1 mi
08550 Princeton Junction, NJ 5.1 mi
08648 Lawrence Township, NJ 5.4 mi

Find every ZIP code within 10 miles of 08541 →

Questions about this ZIP code

Where is ZIP code 08541?

08541 is in Princeton, New Jersey, in Mercer County, part of the Trenton-Princeton, NJ metropolitan area. Its published point location is 40.3487, -74.6590.

What county is 08541 in?

08541 lies in Mercer County.

What area code is 08541?

Princeton uses area codes 609 and 640, from NANPA's telephone records.

What time zone is 08541 in?

08541 uses America/New_York.

What ZIP codes are near 08541?

The closest are 08544 (0.2 mi), 08542 (0.4 mi), 08540 (1.1 mi), 08528 (3.4 mi) and 08553 (3.7 mi).

Is 08541 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.

Download or cite

Cite this page

zipcodes.pro. “08541 ZIP Code — Princeton, New Jersey (Mercer County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/08541

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/08541.json

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