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/80306

80306

ZIP 80306 is in Boulder, Colorado, in Boulder County; area codes 720, 303 and 983; Mountain time. Boulder has 11 ZIP codes in all.

Type
No street area
Time zone
America/Denver
County
Boulder
Metro area
Boulder, CO
Coordinates
40.1022, -105.3847

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 80455, whose figures describe that area — not this ZIP code.

☼ Live from 80306 — Boulder, CO

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Where 80306 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 80306
  • 🔢 Type 80306 into a pocket calculator and turn it upside down: gOEOB — not quite a word, sorry.
  • ➕ As a number, 80,306 = 2 × 40153. Its digits add up to 17, a total 2,133 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011100110110010
  • 🏠 Its numerical neighbours: 80305 (Boulder, CO, 11 mi away) and 80307 (Boulder, CO, 1 mi away).
  • 🔄 Backwards, 80306 becomes 60308, which is not a ZIP code at all.
  • 👥 31 other ZIP codes are made of exactly the same digits (00638, 00683, 03086, 03608, 03860, 06083, …). The farthest-flung twin is 00638 in Ciales, PR, 2,755 miles away.
  • 🧭 Farther north than 57% of all ZIP codes, and farther west than 83%.
  • 🎯361 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 80306 and you would come out at 40.10°S, 74.62°E — 674 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 02m of daylight. Shortest: 9h 19m.
🌙 The sky over 80306 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments25This ZIP25
Employees142This ZIP142
Annual payroll$13,058,000This ZIP$13,058,000

Land area

ZIP codes near 80306

ZIPCityDistance
80455 Jamestown, CO 0.8 mi
80307 Boulder, CO 1.2 mi
80314 Boulder, CO 1.2 mi
80308 Boulder, CO 5.1 mi
80302 Boulder, CO 5.7 mi
80304 Boulder, CO 6.5 mi
80540 Lyons, CO 8.5 mi
80309 Boulder, CO 8.5 mi
80310 Boulder, CO 9.4 mi
80533 Hygiene, CO 9.7 mi

Find every ZIP code within 10 miles of 80306 →

Questions about this ZIP code

Where is ZIP code 80306?

80306 is in Boulder, Colorado, in Boulder County, part of the Boulder, CO metropolitan area. Its published point location is 40.1022, -105.3847.

What county is 80306 in?

80306 lies in Boulder County.

What area code is 80306?

Boulder uses area codes 720, 303 and 983, from NANPA's telephone records.

What time zone is 80306 in?

80306 uses America/Denver.

What ZIP codes are near 80306?

The closest are 80455 (0.8 mi), 80307 (1.2 mi), 80314 (1.2 mi), 80308 (5.1 mi) and 80302 (5.7 mi).

Is 80306 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. “80306 ZIP Code — Boulder, Colorado (Boulder County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/80306

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