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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/06378

06378

ZIP 06378 is Stonington, Connecticut, in New London County; area codes 860 and 959; Eastern time.

Type
Standard
Time zone
America/New_York
County
New London
Metro area
none
Population
5,555
Coordinates
41.3832, -71.9084
☼ Live from 06378 — Stonington, CT

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Local time: —

Where 06378 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 06378
  • 🔢 Type 06378 into a pocket calculator and turn it upside down: BLEgO — not quite a word, sorry.
  • ➕ As a number, 6,378 = 2 × 3 × 1063. Its digits add up to 24, a total 2,425 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1100011101010
  • 🏠 Its numerical neighbours: 06377 (Sterling, CT, 24 mi away) and 06379 (Pawcatuck, CT, 3 mi away).
  • 🔄 Backwards, 06378 becomes 87360, which is not a ZIP code at all.
  • 👥 46 other ZIP codes are made of exactly the same digits (03768, 03867, 06387, 06783, 07836, 07863, …). The farthest-flung twin is 83607 in Caldwell, ID, 2,260 miles away.
  • 🧭 Farther north than 70% of all ZIP codes, and farther east than 95%.
  • 🎯1,398 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 06378 and you would come out at 41.38°S, 108.09°E — 780 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 10m of daylight. Shortest: 9h 11m.
  • 📏 At 20.9 square miles of land, 06378 is bigger than 38% of ZIP codes — room for about 16 Central Parks.
🌙 The sky over 06378 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population5,555This ZIP5,555
Households2,708This ZIP2,708
Housing units3,297This ZIP3,297
Median age58.7This ZIP58.7Connecticut41.1US 38.9
Median household income$135,714This ZIP$135,714Connecticut$95,781US $80,734
Median home value$593,400This ZIP$593,400Connecticut$366,900US $332,700
Median gross rent$1,750This ZIP$1,750Connecticut$1,488US $1,413
Bachelor's degree or higher61.2%This ZIP61.2%
Mean commute26.7 minThis ZIP26.7 min
Population density265.8 / sq miThis ZIP265.8 / sq mi

Business and tax activity

Business establishments162This ZIP162
Employees1,228This ZIP1,228
Annual payroll$77,152,000This ZIP$77,152,000
Tax returns filed3,000This ZIP3,000
Total adjusted gross income$519,677,000This ZIP$519,677,000

Land area

Land area20.90 sq miThis ZIP20.90 sq mi
Water area1.76 sq miThis ZIP1.76 sq mi

Other place names in 06378

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

ZIP codes near 06378

ZIPCityDistance
06372 Old Mystic, CT 2.2 mi
06379 Pawcatuck, CT 3.2 mi
06355 Mystic, CT 3.5 mi
06388 West Mystic, CT 4.4 mi
06339 Ledyard, CT 5.9 mi
06359 North Stonington, CT 6.3 mi
02891 Westerly, RI 6.4 mi
06338 Mashantucket, CT 6.5 mi
06390 Fishers Island, NY 6.7 mi
06340 Groton, CT 7.1 mi

Find every ZIP code within 10 miles of 06378 →

Questions about this ZIP code

Where is ZIP code 06378?

06378 is in Stonington, Connecticut, in New London County. Its published point location is 41.3832, -71.9084.

What county is 06378 in?

06378 lies in New London County.

What area code is 06378?

Stonington uses area codes 860 and 959, from NANPA's telephone records.

What time zone is 06378 in?

06378 uses America/New_York.

How many people live in 06378?

About 5,555 people live in ZIP code 06378, in 2,708 households, at 265.8 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 06378?

$135,714 a year, against $95,781 across Connecticut.

What ZIP codes are near 06378?

The closest are 06372 (2.2 mi), 06379 (3.2 mi), 06355 (3.5 mi), 06388 (4.4 mi) and 06339 (5.9 mi).

Is 06378 a PO Box ZIP code?

06378 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “06378 ZIP Code — Stonington, Connecticut (New London County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/06378

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