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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/06831

06831

ZIP 06831 is in Greenwich, Connecticut, in Fairfield County; area codes 203 and 475; Eastern time. Greenwich has 3 ZIP codes; the others are 06830 and 06836.

Type
Standard
Time zone
America/New_York
County
Fairfield
Metro area
none
Population
15,210
Coordinates
41.0887, -73.6588
☼ Live from 06831 — Greenwich, CT

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Local time: —

Where 06831 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 06831
  • 🔢 Type 06831 into a pocket calculator and turn it upside down: IEBgO — not quite a word, sorry.
  • ➕ As a number, 6,831 = 3 × 3 × 3 × 11 × 23. Its digits add up to 18, a total 2,332 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1101010101111
  • 🏠 Its numerical neighbours: 06830 (Greenwich, CT, 4 mi away) and 06836 (Greenwich, CT, 5 mi away).
  • 🔄 Backwards, 06831 becomes 13860 — and that is a real ZIP code: West Davenport, NY, 116 miles away.
  • 👥 58 other ZIP codes are made of exactly the same digits (01368, 01863, 03816, 03861, 06138, 06183, …). The farthest-flung twin is 83610 in Cambridge, ID, 2,171 miles away.
  • 🧭 Farther north than 67% of all ZIP codes, and farther east than 92%.
  • 🎯1,309 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 06831 and you would come out at 41.09°S, 106.34°E — 822 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 08m of daylight. Shortest: 9h 13m.
  • 📏 At 27.6 square miles of land, 06831 is bigger than 44% of ZIP codes — room for about 21 Central Parks.
🌙 The sky over 06831 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population15,210This ZIP15,210
Households5,382This ZIP5,382
Housing units6,135This ZIP6,135
Median age47.5This ZIP47.5Connecticut41.1US 38.9
Median household income$227,159This ZIP$227,159Connecticut$95,781US $80,734
Median home value$1,696,000This ZIP$1,696,000Connecticut$366,900US $332,700
Median gross rent$3,500+This ZIP$3,500+Connecticut$1,488US $1,413
Bachelor's degree or higher70.9%This ZIP70.9%
Mean commute29.0 minThis ZIP29.0 min
Population density552.0 / sq miThis ZIP552.0 / sq mi

Business and tax activity

Business establishments438This ZIP438
Employees4,494This ZIP4,494
Annual payroll$680,323,000This ZIP$680,323,000
Tax returns filed7,270This ZIP7,270
Total adjusted gross income$5,773,188,000This ZIP$5,773,188,000

Land area

Land area27.55 sq miThis ZIP27.55 sq mi
Water area0.51 sq miThis ZIP0.51 sq mi

Other place names in 06831

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

ZIP codes near 06831

ZIPCityDistance
10504 Armonk, NY 3.7 mi
06830 Greenwich, CT 4.0 mi
06807 Cos Cob, CT 4.1 mi
10610 White Plains, NY 4.4 mi
10577 Purchase, NY 4.4 mi
06836 Greenwich, CT 4.6 mi
10604 West Harrison, NY 4.7 mi
10573 Port Chester, NY 5.1 mi
06903 Stamford, CT 5.6 mi
06878 Riverside, CT 5.6 mi

Find every ZIP code within 10 miles of 06831 →

Questions about this ZIP code

Where is ZIP code 06831?

06831 is in Greenwich, Connecticut, in Fairfield County. Its published point location is 41.0887, -73.6588.

What county is 06831 in?

06831 lies in Fairfield County.

What area code is 06831?

Greenwich uses area codes 203 and 475, from NANPA's telephone records.

What time zone is 06831 in?

06831 uses America/New_York.

How many people live in 06831?

About 15,210 people live in ZIP code 06831, in 5,382 households, at 552.0 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 06831?

$227,159 a year, against $95,781 across Connecticut.

What ZIP codes are near 06831?

The closest are 10504 (3.7 mi), 06830 (4 mi), 06807 (4.1 mi), 10610 (4.4 mi) and 10577 (4.4 mi).

Is 06831 a PO Box ZIP code?

06831 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “06831 ZIP Code — Greenwich, Connecticut (Fairfield County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/06831

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