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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/63304

63304

ZIP 63304 is in Saint Charles, Missouri, in St. Charles County; area code 636; Central time. Saint Charles has 4 ZIP codes; the others are 63301, 63302 and 63303.

Type
Standard
Time zone
America/Chicago
County
St. Charles
Metro area
St. Louis, MO-IL
Population
43,195
Coordinates
38.7061, -90.6860
☼ Live from 63304 — Saint Charles, MO

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Where 63304 is

Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.

★ Weird and wonderful facts about 63304
  • 🔢 Type 63304 into a pocket calculator and turn it upside down: hOEEg — not quite a word, sorry.
  • ➕ As a number, 63,304 = 2 × 2 × 2 × 41 × 193. Its digits add up to 16, a total 1,922 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1111011101001000
  • 🏠 Its numerical neighbours: 63303 (Saint Charles, MO, 8 mi away) and 63330 (Annada, MO, 39 mi away).
  • 🔄 Backwards, 63304 becomes 40336 — and that is a real ZIP code: Irvine, KY, 370 miles away.
  • 👥 29 other ZIP codes are made of exactly the same digits (04336, 04363, 06334, 30346, 30364, 30436, …). The farthest-flung twin is 34036 in APO AA, a military post office, 4,912 miles away.
  • 🧭 Farther south than 53% of all ZIP codes, and farther west than 58%.
  • 🎯429 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 63304 and you would come out at 38.71°S, 89.31°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.
  • 📏 At 55.1 square miles of land, 63304 is bigger than 62% of ZIP codes — room for about 42 Central Parks.
🌙 The sky over 63304 today
  • Working out the sun…
🌋 Shake report
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Source: USGS.

People and housing

Population43,195This ZIP43,195
Households16,284This ZIP16,284
Housing units16,690This ZIP16,690
Median age40.7This ZIP40.7Missouri39.0US 38.9
Median household income$114,442This ZIP$114,442Missouri$70,702US $80,734
Median home value$351,000This ZIP$351,000Missouri$230,300US $332,700
Median gross rent$1,749This ZIP$1,749Missouri$1,033US $1,413
Bachelor's degree or higher49.3%This ZIP49.3%
Mean commute24.4 minThis ZIP24.4 min
Population density783.9 / sq miThis ZIP783.9 / sq mi

Business and tax activity

Business establishments958This ZIP958
Employees12,151This ZIP12,151
Annual payroll$631,230,000This ZIP$631,230,000
Tax returns filed21,490This ZIP21,490
Total adjusted gross income$2,514,894,000This ZIP$2,514,894,000

Land area

Land area55.10 sq miThis ZIP55.10 sq mi
Water area3.29 sq miThis ZIP3.29 sq mi

Other place names in 63304

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 63304

ZIPCityDistance
63338 Cottleville, MO 3.3 mi
63368 O Fallon, MO 3.9 mi
63005 Chesterfield, MO 4.7 mi
63006 Chesterfield, MO 6.6 mi
63341 Defiance, MO 7.2 mi
63367 Lake Saint Louis, MO 7.5 mi
63376 Saint Peters, MO 7.7 mi
63303 Saint Charles, MO 8.0 mi
63017 Chesterfield, MO 8.5 mi
63346 Flinthill, MO 8.6 mi

Find every ZIP code within 10 miles of 63304 →

Questions about this ZIP code

Where is ZIP code 63304?

63304 is in Saint Charles, Missouri, in St. Charles County, part of the St. Louis, MO-IL metropolitan area. Its published point location is 38.7061, -90.6860.

What county is 63304 in?

63304 lies in St. Charles County.

What area code is 63304?

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

What time zone is 63304 in?

63304 uses America/Chicago.

How many people live in 63304?

About 43,195 people live in ZIP code 63304, in 16,284 households, at 783.9 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What is the median household income in 63304?

$114,442 a year, against $70,702 across Missouri.

What ZIP codes are near 63304?

The closest are 63338 (3.3 mi), 63368 (3.9 mi), 63005 (4.7 mi), 63006 (6.6 mi) and 63341 (7.2 mi).

Is 63304 a PO Box ZIP code?

63304 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “63304 ZIP Code — Saint Charles, Missouri (St. Charles County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/63304

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