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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/83731

83731

ZIP 83731 is in Boise, Idaho, in Ada County; area codes 208 and 986; Mountain time. Boise has 28 ZIP codes in all.

Type
No street area
Time zone
America/Boise
County
Ada
Metro area
Boise City, ID
Coordinates
43.4599, -116.2440

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 83634, whose figures describe that area — not this ZIP code.

☼ Live from 83731 — Boise, ID

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Where 83731 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 83731
  • 🔢 Type 83731 into a pocket calculator and turn it upside down: IELEB — not quite a word, sorry.
  • ➕ As a number, 83,731 = 31 × 37 × 73. Its digits add up to 22, a total 2,607 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10100011100010011
  • 🏠 Its numerical neighbours: 83729 (Boise, ID, 0 mi away) and 83732 (Boise, ID, 0 mi away).
  • 🔄 Backwards, 83731 becomes 13738 — and that is a real ZIP code: Blodgett Mills, NY, 2,008 miles away.
  • 👥 25 other ZIP codes are made of exactly the same digits (13738, 13783, 17833, 18337, 31738, 31783, …). The farthest-flung twin is 33187 in Miami, FL, 2,352 miles away.
  • 🧭 Farther north than 85% of all ZIP codes, and farther west than 89%.
  • 🎯944 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 83731 and you would come out at 43.46°S, 63.76°E — 510 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 25m of daylight. Shortest: 8h 57m.
🌙 The sky over 83731 today
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Source: USGS.

Land area

ZIP codes near 83731

ZIPCityDistance
83708 Boise, ID 0.0 mi
83711 Boise, ID 0.0 mi
83715 Boise, ID 0.0 mi
83717 Boise, ID 0.0 mi
83719 Boise, ID 0.0 mi
83722 Boise, ID 0.0 mi
83726 Boise, ID 0.0 mi
83729 Boise, ID 0.0 mi
83732 Boise, ID 0.0 mi
83756 Boise, ID 0.0 mi

Find every ZIP code within 10 miles of 83731 →

Questions about this ZIP code

Where is ZIP code 83731?

83731 is in Boise, Idaho, in Ada County, part of the Boise City, ID metropolitan area. Its published point location is 43.4599, -116.2440.

What county is 83731 in?

83731 lies in Ada County.

What area code is 83731?

Boise uses area codes 208 and 986, from NANPA's telephone records.

What time zone is 83731 in?

83731 uses America/Boise.

What ZIP codes are near 83731?

The closest are 83708 (0 mi), 83711 (0 mi), 83715 (0 mi), 83717 (0 mi) and 83719 (0 mi).

Is 83731 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. “83731 ZIP Code — Boise, Idaho (Ada County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/83731

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