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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/03801

03801

ZIP 03801 is in Portsmouth, New Hampshire, in Rockingham County; area code 603; Eastern time. Portsmouth has 4 ZIP codes; the others are 03802, 03803 and 03804.

Type
Standard
Time zone
America/New_York
County
Rockingham
Population
23,484
Coordinates
43.0748, -70.8054
☼ Live from 03801 — Portsmouth, NH

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Local time: —

Where 03801 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 03801
  • 🔢 Type 03801 into a pocket calculator and turn it upside down: IOBEO — not quite a word, sorry.
  • ➕ As a number, 3,801 = 3 × 7 × 181. Its digits add up to 12, a total 940 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 111011011001
  • 🏠 Its numerical neighbours: 03785 (Woodsville, NH, 84 mi away) and 03802 (Portsmouth, NH, 2 mi away).
  • 🔄 Backwards, 03801 becomes 10830, which is not a ZIP code at all.
  • 👥 34 other ZIP codes are made of exactly the same digits (00831, 01038, 01083, 01380, 01803, 01830, …). The farthest-flung twin is 83001 in Jackson, WY, 1,985 miles away.
  • 🧭 Farther north than 83% of all ZIP codes, and farther east than 96%.
  • 🎯1,449 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 03801 and you would come out at 43.07°S, 109.19°E — 850 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 22m of daylight. Shortest: 9h 00m.
  • 📏 At 23.8 square miles of land, 03801 is bigger than 41% of ZIP codes — room for about 18 Central Parks.
🌙 The sky over 03801 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population23,484This ZIP23,484
Households11,262This ZIP11,262
Housing units11,736This ZIP11,736
Median age43.3This ZIP43.3New Hampshire43.3US 38.9
Median household income$106,756This ZIP$106,756New Hampshire$99,031US $80,734
Median home value$699,900This ZIP$699,900New Hampshire$402,500US $332,700
Median gross rent$1,872This ZIP$1,872New Hampshire$1,491US $1,413
Bachelor's degree or higher63.9%This ZIP63.9%
Mean commute22.2 minThis ZIP22.2 min
Population density988.0 / sq miThis ZIP988.0 / sq mi

Business and tax activity

Business establishments1,956This ZIP1,956
Employees40,621This ZIP40,621
Annual payroll$3,502,687,000This ZIP$3,502,687,000
Tax returns filed13,120This ZIP13,120
Total adjusted gross income$2,356,970,000This ZIP$2,356,970,000

Land area

Land area23.77 sq miThis ZIP23.77 sq mi
Water area5.43 sq miThis ZIP5.43 sq mi

Other place names in 03801

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

ZIP codes near 03801

ZIPCityDistance
03802 Portsmouth, NH 2.2 mi
03803 Portsmouth, NH 2.2 mi
03804 Portsmouth, NH 2.2 mi
03840 Greenland, NH 3.2 mi
03904 Kittery, ME 4.4 mi
03870 Rye, NH 4.4 mi
03854 New Castle, NH 4.5 mi
03903 Eliot, ME 5.2 mi
03885 Stratham, NH 6.4 mi
03824 Durham, NH 6.4 mi

Find every ZIP code within 10 miles of 03801 →

Questions about this ZIP code

Where is ZIP code 03801?

03801 is in Portsmouth, New Hampshire, in Rockingham County, part of the Boston-Cambridge-Newton, MA-NH metropolitan area. Its published point location is 43.0748, -70.8054.

What county is 03801 in?

03801 lies in Rockingham County.

What area code is 03801?

Portsmouth uses area code 603, from NANPA's telephone records.

What time zone is 03801 in?

03801 uses America/New_York.

How many people live in 03801?

About 23,484 people live in ZIP code 03801, in 11,262 households, at 988.0 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 03801?

$106,756 a year, against $99,031 across New Hampshire.

What ZIP codes are near 03801?

The closest are 03802 (2.2 mi), 03803 (2.2 mi), 03804 (2.2 mi), 03840 (3.2 mi) and 03904 (4.4 mi).

Is 03801 a PO Box ZIP code?

03801 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “03801 ZIP Code — Portsmouth, New Hampshire (Rockingham County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/03801

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