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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/78646

78646

ZIP 78646 is in Leander, Texas, in Williamson County; area codes 512 and 737; Central time. Leander has 3 ZIP codes; the others are 78641 and 78645.

Type
No street area
Time zone
America/Chicago
County
Williamson
Coordinates
30.5788, -97.8531

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 78641, whose figures describe that area — not this ZIP code.

☼ Live from 78646 — Leander, TX

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Where 78646 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 78646
  • 🔢 Type 78646 into a pocket calculator and turn it upside down: ghgBL — not quite a word, sorry.
  • ➕ As a number, 78,646 = 2 × 39323. Its digits add up to 31, a total 799 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011001100110110
  • 🏠 Its numerical neighbours: 78645 (Leander, TX, 11 mi away) and 78648 (Luling, TX, 62 mi away).
  • 🔄 Backwards, 78646 becomes 64687, which is not a ZIP code at all.
  • 👥 25 other ZIP codes are made of exactly the same digits (46786, 46867, 47866, 48667, 48766, 64867, …). The farthest-flung twin is 48766 in Twining, MI, 1,207 miles away.
  • 🧭 Farther south than 91% of all ZIP codes, and farther west than 77%.
  • 🎯640 miles south of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 78646 and you would come out at 30.58°S, 82.15°E — 1,438 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 08m of daylight. Shortest: 10h 10m.
🌙 The sky over 78646 today
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Source: USGS.

Business and tax activity

Business establishments20This ZIP20
Employees152This ZIP152
Annual payroll$10,992,000This ZIP$10,992,000

Land area

ZIP codes near 78646

ZIPCityDistance
78641 Leander, TX 3.9 mi
78613 Cedar Park, TX 5.3 mi
78630 Cedar Park, TX 5.4 mi
78628 Georgetown, TX 7.4 mi
78681 Round Rock, TX 8.5 mi
78717 Austin, TX 8.5 mi
78642 Liberty Hill, TX 9.6 mi
78729 Austin, TX 10.2 mi
78726 Austin, TX 10.3 mi
78750 Austin, TX 10.3 mi

Find every ZIP code within 10 miles of 78646 →

Questions about this ZIP code

Where is ZIP code 78646?

78646 is in Leander, Texas, in Williamson County, part of the Austin-Round Rock-San Marcos, TX metropolitan area. Its published point location is 30.5788, -97.8531.

What county is 78646 in?

78646 lies in Williamson County.

What area code is 78646?

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

What time zone is 78646 in?

78646 uses America/Chicago.

What ZIP codes are near 78646?

The closest are 78641 (3.9 mi), 78613 (5.3 mi), 78630 (5.4 mi), 78628 (7.4 mi) and 78681 (8.5 mi).

Is 78646 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. “78646 ZIP Code — Leander, Texas (Williamson County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/78646

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curl https://zipcodes.pro/zip/78646.json

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