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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/77391

77391

ZIP 77391 is in Spring, Texas, in Harris County; area codes 346, 281, 832 and 713; Central time. Spring has 12 ZIP codes in all.

Type
No street area
Time zone
America/Chicago
County
Harris
Coordinates
30.0799, -95.4172

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 77373, whose figures describe that area — not this ZIP code.

☼ Live from 77391 — Spring, TX

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Where 77391 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 77391
  • 🔢 Type 77391 into a pocket calculator and turn it upside down: IGELL — not quite a word, sorry.
  • ➕ As a number, 77,391 = 3 × 3 × 8599. Its digits add up to 27, a total 1,806 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10010111001001111
  • 🏠 Its numerical neighbours: 77389 (Spring, TX, 7 mi away) and 77393 (Spring, TX, 17 mi away).
  • 🔄 Backwards, 77391 becomes 19377, which is not a ZIP code at all.
  • 👥 24 other ZIP codes are made of exactly the same digits (13797, 17739, 31779, 37179, 37719, 37917, …). The farthest-flung twin is 97371 in Rickreall, OR, 1,823 miles away.
  • 🧭 Farther south than 93% of all ZIP codes, and farther west than 69%.
  • 🎯697 miles south of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 77391 and you would come out at 30.08°S, 84.58°E — 1,466 miles from West Island, Cocos Islands, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 05m of daylight. Shortest: 10h 12m.
🌙 The sky over 77391 today
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Source: USGS.

Business and tax activity

Business establishments16This ZIP16
Employees65This ZIP65
Annual payroll$1,788,000This ZIP$1,788,000

Land area

ZIP codes near 77391

ZIPCityDistance
77383 Spring, TX 0.0 mi
77373 Spring, TX 2.3 mi
77387 Spring, TX 2.8 mi
77388 Spring, TX 3.2 mi
77386 Spring, TX 3.9 mi
77380 Spring, TX 5.0 mi
77090 Houston, TX 5.1 mi
77073 Houston, TX 5.6 mi
77068 Houston, TX 6.6 mi
77389 Spring, TX 6.7 mi

Find every ZIP code within 10 miles of 77391 →

Questions about this ZIP code

Where is ZIP code 77391?

77391 is in Spring, Texas, in Harris County, part of the Houston-Pasadena-The Woodlands, TX metropolitan area. Its published point location is 30.0799, -95.4172.

What county is 77391 in?

77391 lies in Harris County.

What area code is 77391?

Spring uses area codes 346, 281, 832 and 713, from NANPA's telephone records.

What time zone is 77391 in?

77391 uses America/Chicago.

What ZIP codes are near 77391?

The closest are 77383 (0 mi), 77373 (2.3 mi), 77387 (2.8 mi), 77388 (3.2 mi) and 77386 (3.9 mi).

Is 77391 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. “77391 ZIP Code — Spring, Texas (Harris County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/77391

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