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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/10543

10543

ZIP 10543 is Mamaroneck, New York, in Westchester County; area code 914; Eastern time.

Type
Standard
Time zone
America/New_York
County
Westchester
Population
20,989
Coordinates
40.9527, -73.7360
☼ Live from 10543 — Mamaroneck, NY

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Local time: —

Where 10543 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 10543
  • 🔢 Type 10543 into a pocket calculator and turn it upside down: EhSOI — not quite a word, sorry.
  • ➕ As a number, 10,543 = 13 × 811. Its digits add up to 13, a total 1,179 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10100100101111
  • 🏠 Its numerical neighbours: 10542 (Mahopac Falls, NY, 29 mi away) and 10545 (Maryknoll, NY, 16 mi away).
  • 🔄 Backwards, 10543 becomes 34501, which is not a ZIP code at all.
  • 👥 64 other ZIP codes are made of exactly the same digits (01354, 01453, 01534, 01543, 03451, 04351, …). The farthest-flung twin is 34051 in FPO AA, a military post office, 1,642 miles away.
  • 🧭 Farther north than 66% of all ZIP codes, and farther east than 91%.
  • 🎯1,305 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 10543 and you would come out at 40.95°S, 106.26°E — 818 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 07m of daylight. Shortest: 9h 14m.
  • 📏 At 4.3 square miles of land, 10543 is bigger than 17% of ZIP codes — room for about 3.3 Central Parks.
🌙 The sky over 10543 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population20,989This ZIP20,989
Households7,630This ZIP7,630
Housing units8,212This ZIP8,212
Median age39.8This ZIP39.8New York39.8US 38.9
Median household income$126,417This ZIP$126,417New York$85,974US $80,734
Median home value$729,600This ZIP$729,600New York$423,800US $332,700
Median gross rent$2,165This ZIP$2,165New York$1,621US $1,413
Bachelor's degree or higher58.1%This ZIP58.1%
Mean commute31.8 minThis ZIP31.8 min
Population density4,900.5 / sq miThis ZIP4,900.5 / sq mi

Business and tax activity

Business establishments880This ZIP880
Employees6,602This ZIP6,602
Annual payroll$396,559,000This ZIP$396,559,000
Tax returns filed9,870This ZIP9,870
Total adjusted gross income$2,176,336,000This ZIP$2,176,336,000

Land area

Land area4.28 sq miThis ZIP4.28 sq mi
Water area0.14 sq miThis ZIP0.14 sq mi

Other place names in 10543

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

ZIP codes near 10543

ZIPCityDistance
10538 Larchmont, NY 1.5 mi
10528 Harrison, NY 1.6 mi
10804 New Rochelle, NY 2.7 mi
10580 Rye, NY 2.9 mi
10801 New Rochelle, NY 3.5 mi
10583 Scarsdale, NY 3.7 mi
10802 New Rochelle, NY 3.7 mi
10709 Eastchester, NY 3.8 mi
10605 White Plains, NY 4.0 mi
10707 Tuckahoe, NY 4.6 mi

Find every ZIP code within 10 miles of 10543 →

Questions about this ZIP code

Where is ZIP code 10543?

10543 is in Mamaroneck, New York, in Westchester County, part of the New York-Newark-Jersey City, NY-NJ metropolitan area. Its published point location is 40.9527, -73.7360.

What county is 10543 in?

10543 lies in Westchester County.

What area code is 10543?

Mamaroneck uses area code 914, from NANPA's telephone records.

What time zone is 10543 in?

10543 uses America/New_York.

How many people live in 10543?

About 20,989 people live in ZIP code 10543, in 7,630 households, at 4,900.5 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 10543?

$126,417 a year, against $85,974 across New York.

What ZIP codes are near 10543?

The closest are 10538 (1.5 mi), 10528 (1.6 mi), 10804 (2.7 mi), 10580 (2.9 mi) and 10801 (3.5 mi).

Is 10543 a PO Box ZIP code?

10543 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “10543 ZIP Code — Mamaroneck, New York (Westchester County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/10543

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