03803

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

Type: No street area
Time zone: America/New_York
County: Rockingham
Metro area: Boston-Cambridge-Newton, MA-NH
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 03803 — Portsmouth, NH

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Where 03803 is

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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 03803

🔢 Type 03803 into a pocket calculator and turn it upside down: EOBEO — not quite a word, sorry.
➕ 03803 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 14, a total 1,416 other ZIP codes share.
💾In binary, the way a computer stores it: 111011011011
🏠 Its numerical neighbours: 03802 (Portsmouth, NH, 0 mi away) and 03804 (Portsmouth, NH, 0 mi away).
🔄 Backwards, 03803 becomes 30830 — and that is a real ZIP code: Waynesboro, GA, 919 miles away.
👥 14 other ZIP codes are made of exactly the same digits (03038, 03830, 08033, 08330, 30038, 30083, …). The farthest-flung twin is 80303 in Boulder, CO, 1,782 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 03803 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.

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Source: USGS.

Land area

ZIP codes near 03803

ZIP	City	Distance
`03802`	Portsmouth, NH	0.0 mi
`03804`	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 03803 →

Questions about this ZIP code

Where is ZIP code 03803?

03803 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 03803 in?

03803 lies in Rockingham County.

What area code is 03803?

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

What time zone is 03803 in?

03803 uses America/New_York.

What ZIP codes are near 03803?

The closest are 03802 (0 mi), 03804 (0 mi), 03801 (2.2 mi), 03854 (2.4 mi) and 03904 (3 mi).

Is 03803 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. “03803 ZIP Code — Portsmouth, New Hampshire (Rockingham County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/03803

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/03803.json

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