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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/06870

06870

ZIP 06870 is Old Greenwich, Connecticut, in Fairfield County; area codes 203 and 475; Eastern time.

Type
Standard
Time zone
America/New_York
County
Fairfield
Metro area
none
Population
7,864
Coordinates
41.0244, -73.5712
☼ Live from 06870 — Old Greenwich, CT

Weather right now

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Local time: —

Where 06870 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 06870
  • 🔢 Type 06870 into a pocket calculator and turn it upside down: OLBgO — not quite a word, sorry.
  • ➕ As a number, 6,870 = 2 × 3 × 5 × 229. Its digits add up to 21, a total 2,594 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1101011010110
  • 🏠 Its numerical neighbours: 06860 (Norwalk, CT, 22 mi away) and 06875 (Redding Center, CT, 22 mi away).
  • 🔄 Backwards, 06870 becomes 07860 — and that is a real ZIP code: Newton, NJ, 64 miles away.
  • 👥 28 other ZIP codes are made of exactly the same digits (00678, 00687, 00786, 06078, 06087, 06708, …). The farthest-flung twin is 87006 in Bosque, NM, 1,861 miles away.
  • 🧭 Farther north than 67% of all ZIP codes, and farther east than 92%.
  • 🎯1,313 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 06870 and you would come out at 41.02°S, 106.43°E — 816 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 08m of daylight. Shortest: 9h 13m.
  • 📏 At 2.3 square miles of land, 06870 is bigger than 12% of ZIP codes — room for about 1.7 Central Parks.
🌙 The sky over 06870 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population7,864This ZIP7,864
Households2,756This ZIP2,756
Housing units2,922This ZIP2,922
Median age40.0This ZIP40.0Connecticut41.1US 38.9
Median household income$250,000+This ZIP$250,000+Connecticut$95,781US $80,734
Median home value$1,788,700This ZIP$1,788,700Connecticut$366,900US $332,700
Median gross rent$3,500+This ZIP$3,500+Connecticut$1,488US $1,413
Bachelor's degree or higher85.4%This ZIP85.4%
Mean commute32.8 minThis ZIP32.8 min
Population density3,468.9 / sq miThis ZIP3,468.9 / sq mi

Business and tax activity

Business establishments242This ZIP242
Employees2,476This ZIP2,476
Annual payroll$448,441,000This ZIP$448,441,000
Tax returns filed3,350This ZIP3,350
Total adjusted gross income$2,736,559,000This ZIP$2,736,559,000

Land area

Land area2.27 sq miThis ZIP2.27 sq mi
Water area1.48 sq miThis ZIP1.48 sq mi

Other place names in 06870

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

ZIP codes near 06870

ZIPCityDistance
06878 Riverside, CT 0.8 mi
06910 Stamford, CT 1.2 mi
06926 Stamford, CT 2.1 mi
06921 Stamford, CT 2.5 mi
06807 Cos Cob, CT 2.5 mi
06904 Stamford, CT 2.6 mi
06911 Stamford, CT 2.6 mi
06912 Stamford, CT 2.6 mi
06913 Stamford, CT 2.6 mi
06914 Stamford, CT 2.6 mi

Find every ZIP code within 10 miles of 06870 →

Questions about this ZIP code

Where is ZIP code 06870?

06870 is in Old Greenwich, Connecticut, in Fairfield County. Its published point location is 41.0244, -73.5712.

What county is 06870 in?

06870 lies in Fairfield County.

What area code is 06870?

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

What time zone is 06870 in?

06870 uses America/New_York.

How many people live in 06870?

About 7,864 people live in ZIP code 06870, in 2,756 households, at 3,468.9 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 06870?

$250,000+ a year, against $95,781 across Connecticut.

What ZIP codes are near 06870?

The closest are 06878 (0.8 mi), 06910 (1.2 mi), 06926 (2.1 mi), 06921 (2.5 mi) and 06807 (2.5 mi).

Is 06870 a PO Box ZIP code?

06870 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “06870 ZIP Code — Old Greenwich, Connecticut (Fairfield County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/06870

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