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/78630

78630

ZIP 78630 is in Cedar Park, Texas, in Williamson County; area codes 512 and 737; Central time. Cedar Park has 2 ZIP codes; the other is 78613.

Type
No street area
Time zone
America/Chicago
County
Williamson
Coordinates
30.5052, -97.8203

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 78613, whose figures describe that area — not this ZIP code.

☼ Live from 78630 — Cedar Park, TX

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Where 78630 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 78630
  • 🔢 Type 78630 into a pocket calculator and turn it upside down: OEgBL — not quite a word, sorry.
  • ➕ As a number, 78,630 = 2 × 3 × 5 × 2621. Its digits add up to 24, a total 2,425 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011001100100110
  • 🏠 Its numerical neighbours: 78629 (Gonzales, TX, 74 mi away) and 78631 (Harper, TX, 89 mi away).
  • 🔄 Backwards, 78630 becomes 03687, which is not a ZIP code at all.
  • 👥 46 other ZIP codes are made of exactly the same digits (03768, 03867, 06378, 06387, 06783, 07836, …). The farthest-flung twin is 03867 in Rochester, NH, 1,715 miles away.
  • 🧭 Farther south than 91% of all ZIP codes, and farther west than 77%.
  • 🎯646 miles south of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 78630 and you would come out at 30.51°S, 82.18°E — 1,444 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 07m of daylight. Shortest: 10h 10m.
🌙 The sky over 78630 today
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🌋 Shake report
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Source: USGS.

Business and tax activity

Business establishments33This ZIP33
Employees180This ZIP180
Annual payroll$19,168,000This ZIP$19,168,000

Land area

ZIP codes near 78630

ZIPCityDistance
78613 Cedar Park, TX 0.1 mi
78717 Austin, TX 4.1 mi
78750 Austin, TX 4.9 mi
78729 Austin, TX 5.0 mi
78726 Austin, TX 5.3 mi
78646 Leander, TX 5.4 mi
78641 Leander, TX 6.6 mi
78681 Round Rock, TX 6.7 mi
78759 Austin, TX 7.9 mi
78727 Austin, TX 8.1 mi

Find every ZIP code within 10 miles of 78630 →

Questions about this ZIP code

Where is ZIP code 78630?

78630 is in Cedar Park, Texas, in Williamson County, part of the Austin-Round Rock-San Marcos, TX metropolitan area. Its published point location is 30.5052, -97.8203.

What county is 78630 in?

78630 lies in Williamson County.

What area code is 78630?

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

What time zone is 78630 in?

78630 uses America/Chicago.

What ZIP codes are near 78630?

The closest are 78613 (0.1 mi), 78717 (4.1 mi), 78750 (4.9 mi), 78729 (5 mi) and 78726 (5.3 mi).

Is 78630 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. “78630 ZIP Code — Cedar Park, Texas (Williamson County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/78630

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/78630.json

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