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/10503

10503

ZIP 10503 is Ardsley On Hudson, New York, in Westchester County; area codes 845 and 329; Eastern time.

Type
Standard
Time zone
America/New_York
County
Westchester
Population
132
Coordinates
41.0266, -73.8753
☼ Live from 10503 — Ardsley On Hudson, NY

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Local time: —

Where 10503 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 10503
  • 🔢 Type 10503 into a pocket calculator and turn it upside down: EOSOI — not quite a word, sorry.
  • ➕ As a number, 10,503 = 3 × 3 × 3 × 389. Its digits add up to 9, a total 375 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10100100000111
  • 🏠 Its numerical neighbours: 10502 (Ardsley, NY, 2 mi away) and 10504 (Armonk, NY, 11 mi away).
  • 🔄 Backwards, 10503 becomes 30501 — and that is a real ZIP code: Gainesville, GA, 713 miles away.
  • 👥 31 other ZIP codes are made of exactly the same digits (01035, 01053, 01350, 01503, 03051, 03105, …). The farthest-flung twin is 51030 in Lawton, IA, 1,151 miles away.
  • 🧭 Farther north than 67% of all ZIP codes, and farther east than 91%.
  • 🎯1,298 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 10503 and you would come out at 41.03°S, 106.12°E — 827 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 08m of daylight. Shortest: 9h 13m.
  • 📏 At 0.015 square miles of land, 10503 is bigger than 0% of ZIP codes — about 7 football fields.
🌙 The sky over 10503 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population132This ZIP132
Households75This ZIP75
Housing units162This ZIP162
Median age73.1This ZIP73.1New York39.8US 38.9
Median household income$243,036This ZIP$243,036New York$85,974US $80,734
Median home value$868,600This ZIP$868,600New York$423,800US $332,700
Bachelor's degree or higher94.7%This ZIP94.7%
Population density8,800.0 / sq miThis ZIP8,800.0 / sq mi

Business and tax activity

Business establishments5This ZIP5
Employees90This ZIP90
Annual payroll$5,002,000This ZIP$5,002,000

Land area

Land area0.02 sq miThis ZIP0.02 sq mi
Water area0.00 sq mi

Other place names in 10503

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

ZIP codes near 10503

ZIPCityDistance
10533 Irvington, NY 1.3 mi
10522 Dobbs Ferry, NY 1.3 mi
10502 Ardsley, NY 2.1 mi
10964 Palisades, NY 2.1 mi
10968 Piermont, NY 2.5 mi
10706 Hastings On Hudson, NY 2.5 mi
10976 Sparkill, NY 2.8 mi
10530 Hartsdale, NY 3.3 mi
10607 White Plains, NY 3.4 mi
07647 Northvale, NJ 3.7 mi

Find every ZIP code within 10 miles of 10503 →

Questions about this ZIP code

Where is ZIP code 10503?

10503 is in Ardsley On Hudson, New York, in Westchester County, part of the New York-Newark-Jersey City, NY-NJ metropolitan area. Its published point location is 41.0266, -73.8753.

What county is 10503 in?

10503 lies in Westchester County.

What area code is 10503?

Ardsley On Hudson uses area codes 845 and 329, from NANPA's telephone records.

What time zone is 10503 in?

10503 uses America/New_York.

How many people live in 10503?

About 132 people live in ZIP code 10503, in 75 households, at 8,800.0 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 10503?

$243,036 a year, against $85,974 across New York.

What ZIP codes are near 10503?

The closest are 10533 (1.3 mi), 10522 (1.3 mi), 10502 (2.1 mi), 10964 (2.1 mi) and 10968 (2.5 mi).

Is 10503 a PO Box ZIP code?

10503 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “10503 ZIP Code — Ardsley On Hudson, New York (Westchester County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/10503

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