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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/11901

11901

ZIP 11901 is Riverhead, New York, in Suffolk County; area codes 631 and 934; Eastern time.

Type
Standard
Time zone
America/New_York
County
Suffolk
Population
33,091
Coordinates
40.9281, -72.6482
☼ Live from 11901 — Riverhead, NY

Weather right now

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Local time: —

Where 11901 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 11901
  • 🔢 Type 11901 into a pocket calculator and turn it upside down: IOGII — not quite a word, sorry.
  • ➕ As a number, 11,901 = 3 × 3967. Its digits add up to 12, a total 940 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111001111101
  • 🏠 Its numerical neighbours: 11853 (Jericho, NY, 48 mi away) and 11930 (Amagansett, NY, 28 mi away).
  • 🔄 Backwards, 11901 becomes 10911 — and that is a real ZIP code: Bear Mountain, NY, 75 miles away.
  • 👥 10 other ZIP codes are made of exactly the same digits (01119, 09111, 10119, 10911, 11109, 19101, …). The farthest-flung twin is 09111 in APO AE, a military post office, 3,764 miles away.
  • 🧭 Farther north than 66% of all ZIP codes, and farther east than 94%.
  • 🎯1,362 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 11901 and you would come out at 40.93°S, 107.35°E — 779 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 07m of daylight. Shortest: 9h 14m.
  • 📏 At 56.7 square miles of land, 11901 is bigger than 63% of ZIP codes — room for about 43 Central Parks.
🌙 The sky over 11901 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population33,091This ZIP33,091
Households12,085This ZIP12,085
Housing units13,578This ZIP13,578
Median age46.5This ZIP46.5New York39.8US 38.9
Median household income$85,061This ZIP$85,061New York$85,974US $80,734
Median home value$453,800This ZIP$453,800New York$423,800US $332,700
Median gross rent$2,196This ZIP$2,196New York$1,621US $1,413
Bachelor's degree or higher22.9%This ZIP22.9%
Mean commute28.4 minThis ZIP28.4 min
Population density583.6 / sq miThis ZIP583.6 / sq mi

Business and tax activity

Business establishments1,288This ZIP1,288
Employees14,663This ZIP14,663
Annual payroll$840,698,000This ZIP$840,698,000
Tax returns filed14,820This ZIP14,820
Total adjusted gross income$988,671,000This ZIP$988,671,000

Land area

Land area56.70 sq miThis ZIP56.70 sq mi
Water area4.78 sq miThis ZIP4.78 sq mi

Other place names in 11901

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

ZIP codes near 11901

ZIPCityDistance
11931 Aquebogue, NY 1.4 mi
11947 Jamesport, NY 3.6 mi
11970 South Jamesport, NY 4.1 mi
11948 Laurel, NY 5.6 mi
11933 Calverton, NY 6.2 mi
11942 East Quogue, NY 6.8 mi
11959 Quogue, NY 7.1 mi
11977 Westhampton, NY 7.1 mi
11978 Westhampton Beach, NY 7.1 mi
11952 Mattituck, NY 7.3 mi

Find every ZIP code within 10 miles of 11901 →

Questions about this ZIP code

Where is ZIP code 11901?

11901 is in Riverhead, New York, in Suffolk County, part of the New York-Newark-Jersey City, NY-NJ metropolitan area. Its published point location is 40.9281, -72.6482.

What county is 11901 in?

11901 lies in Suffolk County.

What area code is 11901?

Riverhead uses area codes 631 and 934, from NANPA's telephone records.

What time zone is 11901 in?

11901 uses America/New_York.

How many people live in 11901?

About 33,091 people live in ZIP code 11901, in 12,085 households, at 583.6 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 11901?

$85,061 a year, against $85,974 across New York.

What ZIP codes are near 11901?

The closest are 11931 (1.4 mi), 11947 (3.6 mi), 11970 (4.1 mi), 11948 (5.6 mi) and 11933 (6.2 mi).

Is 11901 a PO Box ZIP code?

11901 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “11901 ZIP Code — Riverhead, New York (Suffolk County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/11901

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