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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/96731

96731

ZIP 96731 is Kahuku, Hawaii, in Honolulu County; Hawaii-Aleutian time.

Type
Standard
Time zone
Pacific/Honolulu
County
Honolulu
Metro area
Urban Honolulu, HI
Population
2,782
Coordinates
21.6781, -157.9692
☼ Live from 96731 — Kahuku, HI

Weather right now

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Local time: —

Where 96731 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 96731
  • 🔢 Type 96731 into a pocket calculator and turn it upside down: IELgG — not quite a word, sorry.
  • ➕ 96731 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 26, a total 2,038 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111100111011011
  • 🏠 Its numerical neighbours: 96730 (Kaaawa, HI, 13 mi away) and 96732 (Kahului, HI, 112 mi away).
  • 🔄 Backwards, 96731 becomes 13769, which is not a ZIP code at all.
  • 👥 35 other ZIP codes are made of exactly the same digits (13679, 13697, 13796, 16937, 17936, 17963, …). The farthest-flung twin is 19736 in Yorklyn, DE, 4,880 miles away.
  • 🧭 Farther south than 98% of all ZIP codes, and farther west than 99%.
  • 🎯3,671 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 96731 and you would come out at 21.68°S, 22.03°E — 321 miles from Gaborone, Botswana, the nearest big city to that spot.
  • ☀Longest day of the year: 13h 27m of daylight. Shortest: 10h 49m.
  • 📏 At 9.7 square miles of land, 96731 is bigger than 27% of ZIP codes — room for about 7.4 Central Parks.
🌙 The sky over 96731 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population2,782This ZIP2,782
Households801This ZIP801
Housing units1,294This ZIP1,294
Median age33.2This ZIP33.2Hawaii40.9US 38.9
Median household income$73,417This ZIP$73,417Hawaii$100,389US $80,734
Median home value$916,700This ZIP$916,700Hawaii$839,100US $332,700
Median gross rent$1,422This ZIP$1,422Hawaii$1,971US $1,413
Bachelor's degree or higher38.3%This ZIP38.3%
Mean commute31.9 minThis ZIP31.9 min
Population density286.5 / sq miThis ZIP286.5 / sq mi

Business and tax activity

Business establishments60This ZIP60
Employees1,414This ZIP1,414
Annual payroll$70,255,000This ZIP$70,255,000
Tax returns filed1,280This ZIP1,280
Total adjusted gross income$89,654,000This ZIP$89,654,000

Land area

Land area9.71 sq miThis ZIP9.71 sq mi
Water area5.89 sq miThis ZIP5.89 sq mi

Other place names in 96731

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

ZIP codes near 96731

ZIPCityDistance
96712 Haleiwa, HI 2.0 mi
96762 Laie, HI 4.4 mi
96717 Hauula, HI 9.3 mi
96786 Wahiawa, HI 10.3 mi
96730 Kaaawa, HI 12.6 mi
96789 Mililani, HI 13.6 mi
96854 Wheeler Army Airfield, HI 13.8 mi
96857 Schofield Barracks, HI 14.2 mi
96791 Waialua, HI 16.0 mi
96782 Pearl City, HI 16.0 mi

Find every ZIP code within 10 miles of 96731 →

Questions about this ZIP code

Where is ZIP code 96731?

96731 is in Kahuku, Hawaii, in Honolulu County, part of the Urban Honolulu, HI metropolitan area. Its published point location is 21.6781, -157.9692.

What county is 96731 in?

96731 lies in Honolulu County.

What time zone is 96731 in?

96731 uses Pacific/Honolulu.

How many people live in 96731?

About 2,782 people live in ZIP code 96731, in 801 households, at 286.5 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 96731?

$73,417 a year, against $100,389 across Hawaii.

What ZIP codes are near 96731?

The closest are 96712 (2 mi), 96762 (4.4 mi), 96717 (9.3 mi), 96786 (10.3 mi) and 96730 (12.6 mi).

Is 96731 a PO Box ZIP code?

96731 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “96731 ZIP Code — Kahuku, Hawaii (Honolulu County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/96731

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