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/11555

11555

ZIP 11555 is in Uniondale, New York, in Nassau County; area codes 516 and 363; Eastern time. Uniondale has 3 ZIP codes; the others are 11553 and 11556.

Type
No street area
Time zone
America/New_York
County
Nassau
Coordinates
40.7004, -73.5929

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 11553, whose figures describe that area — not this ZIP code.

☼ Live from 11555 — Uniondale, NY

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Where 11555 is

This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 11555
  • 🔢 Type 11555 into a pocket calculator and turn it upside down: SSSII — not quite a word, sorry.
  • ➕ As a number, 11,555 = 5 × 2311. Its digits add up to 17, a total 2,133 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110100100011
  • 🏠 Its numerical neighbours: 11554 (East Meadow, NY, 2 mi away) and 11556 (Uniondale, NY, 1 mi away).
  • 🔄 Backwards, 11555 becomes 55511, which is not a ZIP code at all.
  • 👥 3 other ZIP codes are made of exactly the same digits (15551, 51551, 55115). The farthest-flung twin is 51551 in Malvern, IA, 1,147 miles away.
  • 🧭 Farther north than 63% of all ZIP codes, and farther east than 92%.
  • 🎯1,314 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 11555 and you would come out at 40.70°S, 106.41°E — 800 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 06m of daylight. Shortest: 9h 15m.
🌙 The sky over 11555 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments11This ZIP11
Employees449This ZIP449
Annual payroll$53,898,000This ZIP$53,898,000

Land area

ZIP codes near 11555

ZIPCityDistance
11553 Uniondale, NY 0.3 mi
11549 Hempstead, NY 1.3 mi
11551 Hempstead, NY 1.4 mi
11556 Uniondale, NY 1.4 mi
11575 Roosevelt, NY 1.4 mi
11550 Hempstead, NY 1.5 mi
11554 East Meadow, NY 2.2 mi
11531 Garden City, NY 2.8 mi
11599 Garden City, NY 2.8 mi
11530 Garden City, NY 2.9 mi

Find every ZIP code within 10 miles of 11555 →

Questions about this ZIP code

Where is ZIP code 11555?

11555 is in Uniondale, New York, in Nassau County, part of the New York-Newark-Jersey City, NY-NJ metropolitan area. Its published point location is 40.7004, -73.5929.

What county is 11555 in?

11555 lies in Nassau County.

What area code is 11555?

Uniondale uses area codes 516 and 363, from NANPA's telephone records.

What time zone is 11555 in?

11555 uses America/New_York.

What ZIP codes are near 11555?

The closest are 11553 (0.3 mi), 11549 (1.3 mi), 11551 (1.4 mi), 11556 (1.4 mi) and 11575 (1.4 mi).

Is 11555 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

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Cite this page

zipcodes.pro. “11555 ZIP Code — Uniondale, New York (Nassau County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/11555

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/11555.json

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