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/03854

03854

ZIP 03854 is New Castle, New Hampshire, in Rockingham County; area code 603; Eastern time.

Type
Standard
Time zone
America/New_York
County
Rockingham
Population
827
Coordinates
43.0621, -70.7171
☼ Live from 03854 — New Castle, NH

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 03854 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 03854
  • 🔢 Type 03854 into a pocket calculator and turn it upside down: hSBEO — not quite a word, sorry.
  • ➕ As a number, 3,854 = 2 × 41 × 47. Its digits add up to 20, a total 2,586 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 111100001110
  • 🏠 Its numerical neighbours: 03853 (Mirror Lake, NH, 49 mi away) and 03855 (New Durham, NH, 35 mi away).
  • 🔄 Backwards, 03854 becomes 45830 — and that is a real ZIP code: Columbus Grove, OH, 702 miles away.
  • 👥 58 other ZIP codes are made of exactly the same digits (03458, 03584, 03845, 04358, 04538, 04853, …). The farthest-flung twin is 85340 in Litchfield Park, AZ, 2,330 miles away.
  • 🧭 Farther north than 83% of all ZIP codes, and farther east than 97%.
  • 🎯1,453 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 03854 and you would come out at 43.06°S, 109.28°E — 847 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 22m of daylight. Shortest: 9h 00m.
  • 📏 At 0.809 square miles of land, 03854 is bigger than 7% of ZIP codes — about 392 football fields.
🌙 The sky over 03854 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population827This ZIP827
Households401This ZIP401
Housing units466This ZIP466
Median age62.8This ZIP62.8New Hampshire43.3US 38.9
Median household income$176,953This ZIP$176,953New Hampshire$99,031US $80,734
Median home value$1,701,300This ZIP$1,701,300New Hampshire$402,500US $332,700
Median gross rent$3,500+This ZIP$3,500+New Hampshire$1,491US $1,413
Bachelor's degree or higher68.8%This ZIP68.8%
Mean commute32.6 minThis ZIP32.6 min
Population density1,022.2 / sq miThis ZIP1,022.2 / sq mi

Business and tax activity

Business establishments19This ZIP19
Employees357This ZIP357
Annual payroll$15,046,000This ZIP$15,046,000

Land area

Land area0.81 sq miThis ZIP0.81 sq mi
Water area1.46 sq miThis ZIP1.46 sq mi

ZIP codes near 03854

ZIPCityDistance
03802 Portsmouth, NH 2.4 mi
03803 Portsmouth, NH 2.4 mi
03804 Portsmouth, NH 2.4 mi
03904 Kittery, ME 3.4 mi
03870 Rye, NH 3.7 mi
03801 Portsmouth, NH 4.5 mi
03871 Rye Beach, NH 6.4 mi
03911 York Harbor, ME 6.5 mi
03903 Eliot, ME 6.5 mi
03840 Greenland, NH 6.7 mi

Find every ZIP code within 10 miles of 03854 →

Questions about this ZIP code

Where is ZIP code 03854?

03854 is in New Castle, New Hampshire, in Rockingham County, part of the Boston-Cambridge-Newton, MA-NH metropolitan area. Its published point location is 43.0621, -70.7171.

What county is 03854 in?

03854 lies in Rockingham County.

What area code is 03854?

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

What time zone is 03854 in?

03854 uses America/New_York.

How many people live in 03854?

About 827 people live in ZIP code 03854, in 401 households, at 1,022.2 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 03854?

$176,953 a year, against $99,031 across New Hampshire.

What ZIP codes are near 03854?

The closest are 03802 (2.4 mi), 03803 (2.4 mi), 03804 (2.4 mi), 03904 (3.4 mi) and 03870 (3.7 mi).

Is 03854 a PO Box ZIP code?

03854 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “03854 ZIP Code — New Castle, New Hampshire (Rockingham County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/03854

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/03854.json

Underlying data is public domain or openly licensed — sources, vintages and licences.