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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/07840

07840

ZIP 07840 is Hackettstown, New Jersey, mostly in Warren County; area code 908; Eastern time.

Type
Standard
Time zone
America/New_York
County
Warren +1 more
Population
32,105
Coordinates
40.8600, -74.8318
☼ Live from 07840 — Hackettstown, NJ

Weather right now

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Local time: —

Where 07840 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 07840
  • 🔢 Type 07840 into a pocket calculator and turn it upside down: OhBLO — not quite a word, sorry.
  • ➕ As a number, 7,840 = 2 × 2 × 2 × 2 × 2 × 5 × 7 × 7. Its digits add up to 19, a total 2,454 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1111010100000
  • 🏠 Its numerical neighbours: 07839 (Greendell, NJ, 8 mi away) and 07842 (Hibernia, NJ, 18 mi away).
  • 🔄 Backwards, 07840 becomes 04870, which is not a ZIP code at all.
  • 👥 25 other ZIP codes are made of exactly the same digits (00784, 04078, 04087, 04780, 07480, 08074, …). The farthest-flung twin is 84070 in Sandy, UT, 1,926 miles away.
  • 🧭 Farther north than 65% of all ZIP codes, and farther east than 88%.
  • 🎯1,249 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 07840 and you would come out at 40.86°S, 105.17°E — 854 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 07m of daylight. Shortest: 9h 14m.
  • 📏 At 37.3 square miles of land, 07840 is bigger than 51% of ZIP codes — room for about 28 Central Parks.
🌙 The sky over 07840 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population32,105This ZIP32,105
Households12,768This ZIP12,768
Housing units13,021This ZIP13,021
Median age43.1This ZIP43.1New Jersey40.1US 38.9
Median household income$105,866This ZIP$105,866New Jersey$103,556US $80,734
Median home value$396,100This ZIP$396,100New Jersey$454,400US $332,700
Median gross rent$1,487This ZIP$1,487New Jersey$1,720US $1,413
Bachelor's degree or higher49.6%This ZIP49.6%
Mean commute33.7 minThis ZIP33.7 min
Population density860.0 / sq miThis ZIP860.0 / sq mi

Business and tax activity

Business establishments758This ZIP758
Employees10,894This ZIP10,894
Annual payroll$540,877,000This ZIP$540,877,000
Tax returns filed15,950This ZIP15,950
Total adjusted gross income$1,469,547,000This ZIP$1,469,547,000

Land area

Land area37.33 sq miThis ZIP37.33 sq mi
Water area0.42 sq miThis ZIP0.42 sq mi

Counties 07840 spans

A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.

CountyShare of this ZIP
Warren County 76.4%
Morris County 23.6%

Other place names in 07840

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

ZIP codes near 07840

ZIPCityDistance
07880 Vienna, NJ 2.7 mi
07870 Schooleys Mountain, NJ 3.9 mi
07828 Budd Lake, NJ 4.3 mi
07838 Great Meadows, NJ 4.6 mi
07820 Allamuchy, NJ 5.0 mi
07853 Long Valley, NJ 5.7 mi
07865 Port Murray, NJ 5.7 mi
07836 Flanders, NJ 6.4 mi
07879 Tranquility, NJ 7.0 mi
07863 Oxford, NJ 7.5 mi

Find every ZIP code within 10 miles of 07840 →

Questions about this ZIP code

Where is ZIP code 07840?

07840 is in Hackettstown, New Jersey, in Warren County, part of the Allentown-Bethlehem-Easton, PA-NJ metropolitan area. Its published point location is 40.8600, -74.8318.

What county is 07840 in?

07840 spans 2 counties: Warren County and Morris County. Most of it falls in Warren County, measured by overlapping land area — the county holding the most land in a ZIP code is not always the one holding the most residents.

What area code is 07840?

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

What time zone is 07840 in?

07840 uses America/New_York.

How many people live in 07840?

About 32,105 people live in ZIP code 07840, in 12,768 households, at 860.0 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 07840?

$105,866 a year, against $103,556 across New Jersey.

What ZIP codes are near 07840?

The closest are 07880 (2.7 mi), 07870 (3.9 mi), 07828 (4.3 mi), 07838 (4.6 mi) and 07820 (5 mi).

Is 07840 a PO Box ZIP code?

07840 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “07840 ZIP Code — Hackettstown, New Jersey (Warren County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/07840

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