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/00501

00501

ZIP 00501 is in Holtsville, New York, in Suffolk County; area codes 631 and 934; Eastern time. Holtsville has 3 ZIP codes; the others are 00544 and 11742.

Type
No street area
Time zone
America/New_York
County
Suffolk
Coordinates
40.8154, -73.0451

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 11742, whose figures describe that area — not this ZIP code.

☼ Live from 00501 — Holtsville, NY

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 00501 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 00501
  • 🔢 Type 00501 into a pocket calculator and turn it upside down: IOSOO — not quite a word, sorry.
  • ➕ As a number, 501 = 3 × 167. Its digits add up to 6, a total 90 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 111110101
  • 🏠 Its numerical neighbours: 00544 (Holtsville, NY, 0 mi away).
  • 🔄 Backwards, 00501 becomes 10500, which is not a ZIP code at all.
  • 👥 6 other ZIP codes are made of exactly the same digits (01005, 01050, 05001, 10005, 50001, 50010). The farthest-flung twin is 50010 in Ames, IA, 1,065 miles away.
  • 🧭 Farther north than 65% of all ZIP codes, and farther east than 93%.
  • 🎯1,342 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 00501 and you would come out at 40.82°S, 106.95°E — 787 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 06m of daylight. Shortest: 9h 14m.
🌙 The sky over 00501 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments5This ZIP5
Annual payroll$526,000This ZIP$526,000

Land area

ZIP codes near 00501

ZIPCityDistance
00544 Holtsville, NY 0.0 mi
11742 Holtsville, NY 0.4 mi
11738 Farmingville, NY 1.6 mi
11741 Holbrook, NY 1.9 mi
11763 Medford, NY 3.3 mi
11779 Ronkonkoma, NY 3.6 mi
11784 Selden, NY 3.7 mi
11720 Centereach, NY 4.3 mi
11715 Blue Point, NY 4.5 mi
11755 Lake Grove, NY 4.8 mi

Find every ZIP code within 10 miles of 00501 →

Questions about this ZIP code

Where is ZIP code 00501?

00501 is in Holtsville, New York, in Suffolk County, part of the New York-Newark-Jersey City, NY-NJ metropolitan area. Its published point location is 40.8154, -73.0451.

What county is 00501 in?

00501 lies in Suffolk County.

What area code is 00501?

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

What time zone is 00501 in?

00501 uses America/New_York.

What ZIP codes are near 00501?

The closest are 00544 (0 mi), 11742 (0.4 mi), 11738 (1.6 mi), 11741 (1.9 mi) and 11763 (3.3 mi).

Is 00501 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.

Download or cite

Cite this page

zipcodes.pro. “00501 ZIP Code — Holtsville, New York (Suffolk County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/00501

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/00501.json

Underlying data is public domain or openly licensed — sources, vintages and licences.