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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/08561

08561

ZIP 08561 is Windsor, New Jersey, in Mercer County; area codes 609 and 640; Eastern time.

Type
Standard
Time zone
America/New_York
County
Mercer
Population
325
Coordinates
40.2474, -74.5813
☼ Live from 08561 — Windsor, NJ

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Local time: —

Where 08561 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.

★ Weird and wonderful facts about 08561
  • 🔢 Type 08561 into a pocket calculator and turn it upside down: IgSBO — not quite a word, sorry.
  • ➕ As a number, 8,561 = 7 × 1223. Its digits add up to 20, a total 2,586 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10000101110001
  • 🏠 Its numerical neighbours: 08560 (Titusville, NJ, 15 mi away) and 08562 (Wrightstown, NJ, 13 mi away).
  • 🔄 Backwards, 08561 becomes 16580, which is not a ZIP code at all.
  • 👥 51 other ZIP codes are made of exactly the same digits (01568, 01586, 01865, 05681, 05861, 06518, …). The farthest-flung twin is 85601 in Arivaca, AZ, 2,125 miles away.
  • 🧭 Farther north than 59% of all ZIP codes, and farther east than 89%.
  • 🎯1,266 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 08561 and you would come out at 40.25°S, 105.42°E — 816 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 03m of daylight. Shortest: 9h 18m.
  • 📏 At 1.1 square miles of land, 08561 is bigger than 9% of ZIP codes — about 551 football fields.
🌙 The sky over 08561 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population325This ZIP325
Households129This ZIP129
Housing units129This ZIP129
Median age63.4This ZIP63.4New Jersey40.1US 38.9
Median home value$484,400This ZIP$484,400New Jersey$454,400US $332,700
Bachelor's degree or higher36.7%This ZIP36.7%
Mean commute16.0 minThis ZIP16.0 min
Population density285.6 / sq miThis ZIP285.6 / sq mi

Business and tax activity

Business establishments49This ZIP49
Employees890This ZIP890
Annual payroll$53,635,000This ZIP$53,635,000

Land area

Land area1.14 sq miThis ZIP1.14 sq mi
Water area0.01 sq miThis ZIP0.01 sq mi

Other place names in 08561

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 08561

ZIPCityDistance
08520 Hightstown, NJ 2.3 mi
08691 Trenton, NJ 2.9 mi
08550 Princeton Junction, NJ 3.1 mi
08690 Trenton, NJ 4.4 mi
08501 Allentown, NJ 5.8 mi
08536 Plainsboro, NJ 5.9 mi
08512 Cranbury, NJ 6.1 mi
08619 Trenton, NJ 6.1 mi
08555 Roosevelt, NJ 6.1 mi
08620 Trenton, NJ 6.5 mi

Find every ZIP code within 10 miles of 08561 →

Questions about this ZIP code

Where is ZIP code 08561?

08561 is in Windsor, New Jersey, in Mercer County, part of the Trenton-Princeton, NJ metropolitan area. Its published point location is 40.2474, -74.5813.

What county is 08561 in?

08561 lies in Mercer County.

What area code is 08561?

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

What time zone is 08561 in?

08561 uses America/New_York.

How many people live in 08561?

About 325 people live in ZIP code 08561, in 129 households, at 285.6 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 08561?

The closest are 08520 (2.3 mi), 08691 (2.9 mi), 08550 (3.1 mi), 08690 (4.4 mi) and 08501 (5.8 mi).

Is 08561 a PO Box ZIP code?

08561 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “08561 ZIP Code — Windsor, New Jersey (Mercer County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/08561

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