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/79831

79831

ZIP 79831 is in Alpine, Texas, in Brewster County; area code 432; Central time. Alpine has 3 ZIP codes; the others are 79830 and 79832.

Type
No street area
Time zone
America/Chicago
County
Brewster
Metro area
none
Coordinates
30.3068, -103.6704

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 79830, whose figures describe that area — not this ZIP code.

☼ Live from 79831 — Alpine, TX

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Where 79831 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 79831
  • 🔢 Type 79831 into a pocket calculator and turn it upside down: IEBGL — not quite a word, sorry.
  • ➕ As a number, 79,831 = 97 × 823. Its digits add up to 28, a total 1,520 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011011111010111
  • 🏠 Its numerical neighbours: 79830 (Alpine, TX, 7 mi away) and 79832 (Alpine, TX, 4 mi away).
  • 🔄 Backwards, 79831 becomes 13897, which is not a ZIP code at all.
  • 👥 30 other ZIP codes are made of exactly the same digits (17938, 17983, 31789, 31798, 37189, 37819, …). The farthest-flung twin is 17938 in Hegins, PA, 1,678 miles away.
  • 🧭 Farther south than 92% of all ZIP codes, and farther west than 82%.
  • 🎯718 miles southwest of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 79831 and you would come out at 30.31°S, 76.33°E — 1,354 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 06m of daylight. Shortest: 10h 11m.
🌙 The sky over 79831 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments19This ZIP19
Employees173This ZIP173
Annual payroll$5,124,000This ZIP$5,124,000

Land area

ZIP codes near 79831

ZIPCityDistance
79832 Alpine, TX 4.1 mi
79830 Alpine, TX 7.1 mi
79734 Fort Davis, TX 31.9 mi
79842 Marathon, TX 43.4 mi
79786 Toyahvale, TX 44.6 mi
79718 Balmorhea, TX 47.6 mi
79780 Saragosa, TX 50.6 mi
79843 Marfa, TX 53.7 mi
79735 Fort Stockton, TX 58.9 mi
79854 Valentine, TX 60.1 mi

Find every ZIP code within 10 miles of 79831 →

Questions about this ZIP code

Where is ZIP code 79831?

79831 is in Alpine, Texas, in Brewster County. Its published point location is 30.3068, -103.6704.

What county is 79831 in?

79831 lies in Brewster County.

What area code is 79831?

Alpine uses area code 432, from NANPA's telephone records.

What time zone is 79831 in?

79831 uses America/Chicago.

What ZIP codes are near 79831?

The closest are 79832 (4.1 mi), 79830 (7.1 mi), 79734 (31.9 mi), 79842 (43.4 mi) and 79786 (44.6 mi).

Is 79831 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. “79831 ZIP Code — Alpine, Texas (Brewster County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/79831

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