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/01831

01831

ZIP 01831 is in Haverhill, Massachusetts, in Essex County; area codes 978 and 351; Eastern time. Haverhill has 4 ZIP codes; the others are 01830, 01832 and 01835.

Type
No street area
Time zone
America/New_York
County
Essex
Coordinates
42.7711, -71.1221

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 01832, whose figures describe that area — not this ZIP code.

☼ Live from 01831 — Haverhill, MA

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Where 01831 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 01831
  • 🔢 Type 01831 into a pocket calculator and turn it upside down: IEBIO — not quite a word, sorry.
  • ➕ 01831 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 13, a total 1,179 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 11100100111
  • 🏠 Its numerical neighbours: 01830 (Haverhill, MA, 4 mi away) and 01832 (Haverhill, MA, 1 mi away).
  • 🔄 Backwards, 01831 becomes 13810 — and that is a real ZIP code: Mount Vision, NY, 203 miles away.
  • 👥 30 other ZIP codes are made of exactly the same digits (01138, 01813, 03811, 08311, 10138, 11380, …). The farthest-flung twin is 83110 in Afton, WY, 1,997 miles away.
  • 🧭 Farther north than 81% of all ZIP codes, and farther east than 96%.
  • 🎯1,433 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 01831 and you would come out at 42.77°S, 108.88°E — 839 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 20m of daylight. Shortest: 9h 02m.
🌙 The sky over 01831 today
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🌋 Shake report
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Source: USGS.

Business and tax activity

Business establishments6This ZIP6
Employees148This ZIP148
Annual payroll$9,268,000This ZIP$9,268,000

Land area

ZIP codes near 01831

ZIPCityDistance
01832 Haverhill, MA 1.5 mi
01835 Haverhill, MA 2.0 mi
01844 Methuen, MA 3.5 mi
01830 Haverhill, MA 3.9 mi
01841 Lawrence, MA 4.1 mi
01840 Lawrence, MA 4.9 mi
01842 Lawrence, MA 4.9 mi
03079 Salem, NH 5.2 mi
03811 Atkinson, NH 5.2 mi
01885 West Boxford, MA 5.3 mi

Find every ZIP code within 10 miles of 01831 →

Questions about this ZIP code

Where is ZIP code 01831?

01831 is in Haverhill, Massachusetts, in Essex County, part of the Boston-Cambridge-Newton, MA-NH metropolitan area. Its published point location is 42.7711, -71.1221.

What county is 01831 in?

01831 lies in Essex County.

What area code is 01831?

Haverhill uses area codes 978 and 351, from NANPA's telephone records.

What time zone is 01831 in?

01831 uses America/New_York.

What ZIP codes are near 01831?

The closest are 01832 (1.5 mi), 01835 (2 mi), 01844 (3.5 mi), 01830 (3.9 mi) and 01841 (4.1 mi).

Is 01831 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. “01831 ZIP Code — Haverhill, Massachusetts (Essex County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/01831

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/01831.json

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