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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/01801

01801

ZIP 01801 is in Woburn, Massachusetts, in Middlesex County; area codes 781 and 339; Eastern time. Woburn has 4 ZIP codes; the others are 01813, 01815 and 01888.

Type
Standard
Time zone
America/New_York
County
Middlesex
Population
41,939
Coordinates
42.4887, -71.1544
☼ Live from 01801 — Woburn, MA

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Where 01801 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 01801
  • 🔢 Type 01801 into a pocket calculator and turn it upside down: IOBIO — not quite a word, sorry.
  • ➕ 01801 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 10, a total 513 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 11100001001
  • 🏠 Its numerical neighbours: 01784 (Woodville, MA, 27 mi away) and 01803 (Burlington, MA, 3 mi away).
  • 🔄 Backwards, 01801 becomes 10810, which is not a ZIP code at all.
  • 👥 16 other ZIP codes are made of exactly the same digits (01081, 01108, 01810, 08011, 08101, 08110, …). The farthest-flung twin is 81010 in Pueblo, CO, 1,773 miles away.
  • 🧭 Farther north than 79% of all ZIP codes, and farther east than 96%.
  • 🎯1,432 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 01801 and you would come out at 42.49°S, 108.85°E — 823 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 18m of daylight. Shortest: 9h 03m.
  • 📏 At 12.7 square miles of land, 01801 is bigger than 30% of ZIP codes — room for about 9.6 Central Parks.
🌙 The sky over 01801 today
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🌋 Shake report
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Source: USGS.

People and housing

Population41,939This ZIP41,939
Households16,432This ZIP16,432
Housing units17,045This ZIP17,045
Median age39.3This ZIP39.3Massachusetts40.0US 38.9
Median household income$111,185This ZIP$111,185Massachusetts$103,960US $80,734
Median home value$673,500This ZIP$673,500Massachusetts$562,100US $332,700
Median gross rent$2,221This ZIP$2,221Massachusetts$1,762US $1,413
Bachelor's degree or higher46.5%This ZIP46.5%
Mean commute25.3 minThis ZIP25.3 min
Population density3,300.5 / sq miThis ZIP3,300.5 / sq mi

Business and tax activity

Business establishments2,168This ZIP2,168
Employees47,661This ZIP47,661
Annual payroll$4,083,071,000This ZIP$4,083,071,000
Tax returns filed22,790This ZIP22,790
Total adjusted gross income$2,274,302,000This ZIP$2,274,302,000

Land area

Land area12.71 sq miThis ZIP12.71 sq mi
Water area0.29 sq miThis ZIP0.29 sq mi

Other place names in 01801

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

ZIP codes near 01801

ZIPCityDistance
01813 Woburn, MA 0.7 mi
01815 Woburn, MA 0.7 mi
01888 Woburn, MA 0.7 mi
01805 Burlington, MA 2.4 mi
01890 Winchester, MA 2.5 mi
01803 Burlington, MA 2.6 mi
02180 Stoneham, MA 3.1 mi
02420 Lexington, MA 3.8 mi
01867 Reading, MA 4.1 mi
02474 Arlington, MA 4.7 mi

Find every ZIP code within 10 miles of 01801 →

Questions about this ZIP code

Where is ZIP code 01801?

01801 is in Woburn, Massachusetts, in Middlesex County, part of the Boston-Cambridge-Newton, MA-NH metropolitan area. Its published point location is 42.4887, -71.1544.

What county is 01801 in?

01801 lies in Middlesex County.

What area code is 01801?

Woburn uses area codes 781 and 339, from NANPA's telephone records.

What time zone is 01801 in?

01801 uses America/New_York.

How many people live in 01801?

About 41,939 people live in ZIP code 01801, in 16,432 households, at 3,300.5 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 01801?

$111,185 a year, against $103,960 across Massachusetts.

What ZIP codes are near 01801?

The closest are 01813 (0.7 mi), 01815 (0.7 mi), 01888 (0.7 mi), 01805 (2.4 mi) and 01890 (2.5 mi).

Is 01801 a PO Box ZIP code?

01801 is a standard ZIP code. A normal ZIP code with street delivery.

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zipcodes.pro. “01801 ZIP Code — Woburn, Massachusetts (Middlesex County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/01801

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