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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/63338

63338

ZIP 63338 is Cottleville, Missouri, in St. Charles County; area code 636; Central time.

Type
No street area
Time zone
America/Chicago
County
St. Charles
Metro area
St. Louis, MO-IL
Coordinates
38.7462, -90.6540

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 63304, whose figures describe that area — not this ZIP code.

☼ Live from 63338 — Cottleville, MO

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Where 63338 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 63338
  • 🔢 Type 63338 into a pocket calculator and turn it upside down: BEEEg — not quite a word, sorry.
  • ➕ As a number, 63,338 = 2 × 11 × 2879. Its digits add up to 23, a total 2,533 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1111011101101010
  • 🏠 Its numerical neighbours: 63336 (Clarksville, MO, 43 mi away) and 63339 (Curryville, MO, 55 mi away).
  • 🔄 Backwards, 63338 becomes 83336 — and that is a real ZIP code: Heyburn, ID, 1,239 miles away.
  • 👥 11 other ZIP codes are made of exactly the same digits (33836, 33863, 38336, 38363, 38633, 63383, …). The farthest-flung twin is 83633 in King Hill, ID, 1,311 miles away.
  • 🧭 Farther south than 53% of all ZIP codes, and farther west than 58%.
  • 🎯430 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 63338 and you would come out at 38.75°S, 89.35°E — 1,194 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 53m of daylight. Shortest: 9h 27m.
🌙 The sky over 63338 today
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🌋 Shake report
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Source: USGS.

Business and tax activity

Business establishments9This ZIP9
Employees103This ZIP103
Annual payroll$4,927,000This ZIP$4,927,000

Land area

ZIP codes near 63338

ZIPCityDistance
63304 Saint Charles, MO 3.3 mi
63368 O Fallon, MO 4.0 mi
63376 Saint Peters, MO 4.4 mi
63303 Saint Charles, MO 6.0 mi
63346 Flinthill, MO 6.3 mi
63005 Chesterfield, MO 7.0 mi
63006 Chesterfield, MO 7.1 mi
63367 Lake Saint Louis, MO 7.8 mi
63366 O Fallon, MO 8.6 mi
63017 Chesterfield, MO 8.7 mi

Find every ZIP code within 10 miles of 63338 →

Questions about this ZIP code

Where is ZIP code 63338?

63338 is in Cottleville, Missouri, in St. Charles County, part of the St. Louis, MO-IL metropolitan area. Its published point location is 38.7462, -90.6540.

What county is 63338 in?

63338 lies in St. Charles County.

What area code is 63338?

Cottleville uses area code 636, from NANPA's telephone records.

What time zone is 63338 in?

63338 uses America/Chicago.

What ZIP codes are near 63338?

The closest are 63304 (3.3 mi), 63368 (4 mi), 63376 (4.4 mi), 63303 (6 mi) and 63346 (6.3 mi).

Is 63338 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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zipcodes.pro. “63338 ZIP Code — Cottleville, Missouri (St. Charles County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/63338

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