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/03804

03804

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

Type
No street area
Time zone
America/New_York
County
Rockingham
Coordinates
43.0718, -70.7626

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 03801, whose figures describe that area — not this ZIP code.

☼ Live from 03804 — Portsmouth, NH

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Where 03804 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 03804
  • 🔢 Type 03804 into a pocket calculator and turn it upside down: hOBEO — not quite a word, sorry.
  • ➕ As a number, 3,804 = 2 × 2 × 3 × 317. Its digits add up to 15, a total 1,657 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 111011011100
  • 🏠 Its numerical neighbours: 03803 (Portsmouth, NH, 0 mi away) and 03809 (Alton, NH, 35 mi away).
  • 🔄 Backwards, 03804 becomes 40830 — and that is a real ZIP code: Gulston, KY, 794 miles away.
  • 👥 26 other ZIP codes are made of exactly the same digits (03048, 03084, 03840, 04038, 04083, 08034, …). The farthest-flung twin is 34008 in APO AA, a military post office, 2,396 miles away.
  • 🧭 Farther north than 83% of all ZIP codes, and farther east than 97%.
  • 🎯1,451 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 03804 and you would come out at 43.07°S, 109.24°E — 849 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 22m of daylight. Shortest: 9h 00m.
🌙 The sky over 03804 today
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🌋 Shake report
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Source: USGS.

Business and tax activity

Business establishments4This ZIP4
Employees83This ZIP83
Annual payroll$4,332,000This ZIP$4,332,000

Land area

ZIP codes near 03804

ZIPCityDistance
03802 Portsmouth, NH 0.0 mi
03803 Portsmouth, NH 0.0 mi
03801 Portsmouth, NH 2.2 mi
03854 New Castle, NH 2.4 mi
03904 Kittery, ME 3.0 mi
03870 Rye, NH 3.6 mi
03840 Greenland, NH 4.7 mi
03903 Eliot, ME 5.2 mi
03871 Rye Beach, NH 6.3 mi
03862 North Hampton, NH 7.2 mi

Find every ZIP code within 10 miles of 03804 →

Questions about this ZIP code

Where is ZIP code 03804?

03804 is in Portsmouth, New Hampshire, in Rockingham County, part of the Boston-Cambridge-Newton, MA-NH metropolitan area. Its published point location is 43.0718, -70.7626.

What county is 03804 in?

03804 lies in Rockingham County.

What area code is 03804?

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

What time zone is 03804 in?

03804 uses America/New_York.

What ZIP codes are near 03804?

The closest are 03802 (0 mi), 03803 (0 mi), 03801 (2.2 mi), 03854 (2.4 mi) and 03904 (3 mi).

Is 03804 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. “03804 ZIP Code — Portsmouth, New Hampshire (Rockingham County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/03804

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curl https://zipcodes.pro/zip/03804.json

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