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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/08821

08821

ZIP 08821 is Flagtown, New Jersey, in Somerset County; area code 908; Eastern time.

Type
Standard
Time zone
America/New_York
County
Somerset
Population
283
Coordinates
40.5207, -74.6883
☼ Live from 08821 — Flagtown, NJ

Weather right now

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Local time: —

Where 08821 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 08821
  • 🔢 Type 08821 into a pocket calculator and turn it upside down: IZBBO — not quite a word, sorry.
  • ➕ 08821 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 19, a total 2,454 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10001001110101
  • 🏠 Its numerical neighbours: 08820 (Edison, NJ, 17 mi away) and 08822 (Flemington, NJ, 9 mi away).
  • 🔄 Backwards, 08821 becomes 12880, which is not a ZIP code at all.
  • 👥 29 other ZIP codes are made of exactly the same digits (02188, 02818, 02881, 08218, 08812, 12808, …). The farthest-flung twin is 88021 in Anthony, NM, 1,872 miles away.
  • 🧭 Farther north than 61% of all ZIP codes, and farther east than 88%.
  • 🎯1,258 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 08821 and you would come out at 40.52°S, 105.31°E — 833 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 04m of daylight. Shortest: 9h 16m.
  • 📏 At 0.238 square miles of land, 08821 is bigger than 3% of ZIP codes — about 115 football fields.
🌙 The sky over 08821 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population283This ZIP283
Households108This ZIP108
Housing units108This ZIP108
Median age40.1This ZIP40.1New Jersey40.1US 38.9
Median household income$155,833This ZIP$155,833New Jersey$103,556US $80,734
Median home value$443,300This ZIP$443,300New Jersey$454,400US $332,700
Bachelor's degree or higher35.1%This ZIP35.1%
Mean commute22.5 minThis ZIP22.5 min
Population density1,189.1 / sq miThis ZIP1,189.1 / sq mi

Business and tax activity

Business establishments9This ZIP9
Employees53This ZIP53
Annual payroll$3,288,000This ZIP$3,288,000

Land area

Land area0.24 sq miThis ZIP0.24 sq mi
Water area0.00 sq mi

Other place names in 08821

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

ZIP codes near 08821

ZIPCityDistance
08844 Hillsborough, NJ 1.8 mi
08853 Neshanic Station, NJ 2.9 mi
08869 Raritan, NJ 4.1 mi
08870 Readington, NJ 4.2 mi
08876 Somerville, NJ 4.8 mi
08502 Belle Mead, NJ 5.3 mi
08835 Manville, NJ 5.4 mi
08887 Three Bridges, NJ 5.7 mi
08890 Zarephath, NJ 6.1 mi
08807 Bridgewater, NJ 6.2 mi

Find every ZIP code within 10 miles of 08821 →

Questions about this ZIP code

Where is ZIP code 08821?

08821 is in Flagtown, New Jersey, in Somerset County, part of the New York-Newark-Jersey City, NY-NJ metropolitan area. Its published point location is 40.5207, -74.6883.

What county is 08821 in?

08821 lies in Somerset County.

What area code is 08821?

Flagtown uses area code 908, from NANPA's telephone records.

What time zone is 08821 in?

08821 uses America/New_York.

How many people live in 08821?

About 283 people live in ZIP code 08821, in 108 households, at 1,189.1 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What is the median household income in 08821?

$155,833 a year, against $103,556 across New Jersey.

What ZIP codes are near 08821?

The closest are 08844 (1.8 mi), 08853 (2.9 mi), 08869 (4.1 mi), 08870 (4.2 mi) and 08876 (4.8 mi).

Is 08821 a PO Box ZIP code?

08821 is a standard ZIP code. A normal ZIP code with street delivery.

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zipcodes.pro. “08821 ZIP Code — Flagtown, New Jersey (Somerset County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/08821

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