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/03305

03305

ZIP 03305 is in Concord, New Hampshire, in Merrimack County; area code 603; Eastern time. Concord has 4 ZIP codes; the others are 03301, 03302 and 03303.

Type
No street area
Time zone
America/New_York
County
Merrimack
Metro area
Concord, NH
Coordinates
43.2134, -71.5172

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 03301, whose figures describe that area — not this ZIP code.

☼ Live from 03305 — Concord, NH

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Where 03305 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 03305
  • 🔢 Type 03305 into a pocket calculator and turn it upside down: SOEEO — not quite a word, sorry.
  • ➕ As a number, 3,305 = 5 × 661. Its digits add up to 11, a total 714 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 110011101001
  • 🏠 Its numerical neighbours: 03304 (Bow, NH, 6 mi away) and 03307 (Loudon, NH, 9 mi away).
  • 🔄 Backwards, 03305 becomes 50330 — and that is a real ZIP code: Des Moines, IA, 1,126 miles away.
  • 👥 13 other ZIP codes are made of exactly the same digits (03053, 05033, 05303, 30035, 30305, 30350, …). The farthest-flung twin is 33050 in Marathon, FL, 1,384 miles away.
  • 🧭 Farther north than 84% of all ZIP codes, and farther east than 95%.
  • 🎯1,413 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 03305 and you would come out at 43.21°S, 108.48°E — 876 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 23m of daylight. Shortest: 8h 59m.
🌙 The sky over 03305 today
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Source: USGS.

Land area

ZIP codes near 03305

ZIPCityDistance
03301 Concord, NH 2.6 mi
03304 Bow, NH 5.6 mi
03275 Suncook, NH 5.7 mi
03258 Chichester, NH 6.5 mi
03046 Dunbarton, NH 8.3 mi
03234 Epsom, NH 8.5 mi
03307 Loudon, NH 9.1 mi
03229 Contoocook, NH 9.1 mi
03224 Canterbury, NH 9.6 mi
03106 Hooksett, NH 9.8 mi

Find every ZIP code within 10 miles of 03305 →

Questions about this ZIP code

Where is ZIP code 03305?

03305 is in Concord, New Hampshire, in Merrimack County, part of the Concord, NH micropolitan area. Its published point location is 43.2134, -71.5172.

What county is 03305 in?

03305 lies in Merrimack County.

What area code is 03305?

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

What time zone is 03305 in?

03305 uses America/New_York.

What ZIP codes are near 03305?

The closest are 03301 (2.6 mi), 03304 (5.6 mi), 03275 (5.7 mi), 03258 (6.5 mi) and 03046 (8.3 mi).

Is 03305 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. “03305 ZIP Code — Concord, New Hampshire (Merrimack County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/03305

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curl https://zipcodes.pro/zip/03305.json

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