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/78766

78766

ZIP 78766 is in Austin, Texas, in Travis County; area codes 512 and 737; Central time. Austin has 74 ZIP codes in all.

Type
No street area
Time zone
America/Chicago
County
Travis
Coordinates
30.2672, -97.7431

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 78701, whose figures describe that area — not this ZIP code.

☼ Live from 78766 — Austin, TX

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Where 78766 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 78766
  • 🔢 Type 78766 into a pocket calculator and turn it upside down: ggLBL — not quite a word, sorry.
  • ➕ As a number, 78,766 = 2 × 39383. Its digits add up to 34, a total 322 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011001110101110
  • 🏠 Its numerical neighbours: 78765 (Austin, TX, 4 mi away) and 78767 (Austin, TX, 0 mi away).
  • 🔄 Backwards, 78766 becomes 66787, which is not a ZIP code at all.
  • 👥 10 other ZIP codes are made of exactly the same digits (66778, 67867, 67876, 68767, 68776, 76678, …). The farthest-flung twin is 68776 in South Sioux City, NE, 845 miles away.
  • 🧭 Farther south than 92% of all ZIP codes, and farther west than 76%.
  • 🎯662 miles south of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 78766 and you would come out at 30.27°S, 82.26°E — 1,461 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 78766 today
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Source: USGS.

Business and tax activity

Business establishments15This ZIP15
Employees56This ZIP56
Annual payroll$1,958,000This ZIP$1,958,000

Land area

ZIP codes near 78766

ZIPCityDistance
78713 Austin, TX 0.0 mi
78714 Austin, TX 0.0 mi
78715 Austin, TX 0.0 mi
78767 Austin, TX 0.0 mi
78768 Austin, TX 0.0 mi
78799 Austin, TX 0.0 mi
78701 Austin, TX 0.2 mi
78712 Austin, TX 1.3 mi
78702 Austin, TX 1.7 mi
78705 Austin, TX 1.9 mi

Find every ZIP code within 10 miles of 78766 →

Questions about this ZIP code

Where is ZIP code 78766?

78766 is in Austin, Texas, in Travis County, part of the Austin-Round Rock-San Marcos, TX metropolitan area. Its published point location is 30.2672, -97.7431.

What county is 78766 in?

78766 lies in Travis County.

What area code is 78766?

Austin uses area codes 512 and 737, from NANPA's telephone records.

What time zone is 78766 in?

78766 uses America/Chicago.

What ZIP codes are near 78766?

The closest are 78713 (0 mi), 78714 (0 mi), 78715 (0 mi), 78767 (0 mi) and 78768 (0 mi).

Is 78766 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. “78766 ZIP Code — Austin, Texas (Travis County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/78766

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