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/03257

03257

ZIP 03257 is New London, New Hampshire, mostly in Merrimack County; area code 603; Eastern time.

Type
Standard
Time zone
America/New_York
County
Merrimack +1 more
Metro area
Concord, NH
Population
4,484
Coordinates
43.4177, -71.9906
☼ Live from 03257 — New London, NH

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 03257 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 03257
  • 🔢 Type 03257 into a pocket calculator and turn it upside down: LSZEO — not quite a word, sorry.
  • ➕ 03257 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 17, a total 2,133 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 110010111001
  • 🏠 Its numerical neighbours: 03256 (New Hampton, NH, 23 mi away) and 03258 (Chichester, NH, 31 mi away).
  • 🔄 Backwards, 03257 becomes 75230 — and that is a real ZIP code: Dallas, TX, 1,522 miles away.
  • 👥 65 other ZIP codes are made of exactly the same digits (02357, 02375, 02537, 03275, 03752, 05732, …). The farthest-flung twin is 73502 in Lawton, OK, 1,534 miles away.
  • 🧭 Farther north than 85% of all ZIP codes, and farther east than 95%.
  • 🎯1,389 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 03257 and you would come out at 43.42°S, 108.01°E — 900 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 25m of daylight. Shortest: 8h 57m.
  • 📏 At 23.6 square miles of land, 03257 is bigger than 41% of ZIP codes — room for about 18 Central Parks.
🌙 The sky over 03257 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population4,484This ZIP4,484
Households1,650This ZIP1,650
Housing units2,409This ZIP2,409
Median age50.9This ZIP50.9New Hampshire43.3US 38.9
Median household income$107,000This ZIP$107,000New Hampshire$99,031US $80,734
Median home value$559,000This ZIP$559,000New Hampshire$402,500US $332,700
Median gross rent$1,594This ZIP$1,594New Hampshire$1,491US $1,413
Bachelor's degree or higher64.7%This ZIP64.7%
Mean commute24.9 minThis ZIP24.9 min
Population density190.4 / sq miThis ZIP190.4 / sq mi

Business and tax activity

Business establishments177This ZIP177
Employees2,362This ZIP2,362
Annual payroll$125,750,000This ZIP$125,750,000
Tax returns filed2,390This ZIP2,390
Total adjusted gross income$474,080,000This ZIP$474,080,000

Land area

Land area23.55 sq miThis ZIP23.55 sq mi
Water area3.09 sq miThis ZIP3.09 sq mi

Counties 03257 spans

A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.

CountyShare of this ZIP
Merrimack County 96.8%
Sullivan County 3.2%

Other place names in 03257

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

ZIP codes near 03257

ZIPCityDistance
03233 Elkins, NH 3.0 mi
03287 Wilmot, NH 3.8 mi
03284 Springfield, NH 4.0 mi
03751 Georges Mills, NH 4.8 mi
03260 North Sutton, NH 5.0 mi
03782 Sunapee, NH 5.5 mi
03255 Newbury, NH 7.4 mi
03754 Guild, NH 7.9 mi
03272 South Newbury, NH 8.4 mi
03273 South Sutton, NH 8.6 mi

Find every ZIP code within 10 miles of 03257 →

Questions about this ZIP code

Where is ZIP code 03257?

03257 is in New London, New Hampshire, in Merrimack County, part of the Concord, NH micropolitan area. Its published point location is 43.4177, -71.9906.

What county is 03257 in?

03257 spans 2 counties: Merrimack County and Sullivan County. Most of it falls in Merrimack County, measured by overlapping land area — the county holding the most land in a ZIP code is not always the one holding the most residents.

What area code is 03257?

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

What time zone is 03257 in?

03257 uses America/New_York.

How many people live in 03257?

About 4,484 people live in ZIP code 03257, in 1,650 households, at 190.4 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 03257?

$107,000 a year, against $99,031 across New Hampshire.

What ZIP codes are near 03257?

The closest are 03233 (3 mi), 03287 (3.8 mi), 03284 (4 mi), 03751 (4.8 mi) and 03260 (5 mi).

Is 03257 a PO Box ZIP code?

03257 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “03257 ZIP Code — New London, New Hampshire (Merrimack County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/03257

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/03257.json

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