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 — PREFIX/633

ZIP codes starting with 633

ZIP codes
51
States
MO
Largest city
Saint Peters, MO
Population
547,941

The first three digits of a ZIP code identify a sectional center facility — the postal processing plant that sorts mail for the area. It is a mail-routing grouping, not an administrative boundary.

Every ZIP code in 633xx

ZIP codes starting with 633
ZIP City Type Population Median income Median home
63301 Saint Charles , MO Standard 52,667 $85,308 $267,600
63302 Saint Charles , MO No street area — — —
63303 Saint Charles , MO Standard 46,089 $99,138 $321,100
63304 Saint Charles , MO Standard 43,195 $114,442 $351,000
63330 Annada , MO Standard 108 $57,614 —
63332 Augusta , MO Standard 1,651 $146,146 $385,400
63333 Bellflower , MO Standard 688 $64,688 $165,800
63334 Bowling Green , MO Standard 7,564 $54,638 $159,800
63336 Clarksville , MO Standard 1,079 $71,875 $162,500
63338 Cottleville , MO No street area — — —
63339 Curryville , MO Standard 996 $82,321 $209,100
63341 Defiance , MO Standard 3,515 $170,598 $606,800
63342 Dutzow , MO No street area — — —
63343 Elsberry , MO Standard 4,381 $74,531 $169,400
63344 Eolia , MO Standard 1,501 $69,250 $186,100
63345 Farber , MO Standard 291 $43,500 $80,300
63346 Flinthill , MO No street area — — —
63347 Foley , MO Standard 3,140 $81,949 $172,000
63348 Foristell , MO Standard 10,394 $115,661 $386,200
63349 Hawk Point , MO Standard 2,149 $80,375 $250,000
63350 High Hill , MO Standard 769 $69,111 —
63351 Jonesburg , MO Standard 1,389 $67,500 $207,100
63352 Laddonia , MO Standard 1,018 $54,485 $98,000
63353 Louisiana , MO Standard 4,790 $46,875 $95,700
63357 Marthasville , MO Standard 6,536 $92,200 $292,600
63359 Middletown , MO Standard 1,667 $75,227 $160,200
63361 Montgomery City , MO Standard 4,460 $62,371 $186,700
63362 Moscow Mills , MO Standard 9,930 $88,977 $235,900
63363 New Florence , MO Standard 949 $47,188 $97,800
63365 New Melle , MO Standard 51 $53,542 —
63366 O Fallon , MO Standard 54,769 $100,621 $304,500
63367 Lake Saint Louis , MO Standard 29,725 $137,648 $409,100
63368 O Fallon , MO Standard 46,966 $124,297 $349,200
63369 Old Monroe , MO Standard 2,822 $96,250 $339,400
63370 Olney , MO No street area — — —
63373 Portage Des Sioux , MO Standard 690 $88,750 $221,300
63376 Saint Peters , MO Standard 74,962 $96,393 $275,400
63377 Silex , MO Standard 3,501 $88,424 $233,600
63378 Treloar , MO No street area — — —
63379 Troy , MO Standard 27,731 $91,194 $256,600
63380 Truesdale , MO Standard 990 $58,750 $214,300
63381 Truxton , MO Standard 618 $111,890 $237,200
63382 Vandalia , MO Standard 4,033 $60,733 $96,300
63383 Warrenton , MO Standard 16,927 $75,282 $243,100
63384 Wellsville , MO Standard 2,049 $78,281 $128,600
63385 Wentzville , MO Standard 51,330 $112,199 $347,200
63386 West Alton , MO Standard 482 $110,250 $157,000
63387 Whiteside , MO Standard 108 $104,375 $96,700
63388 Williamsburg , MO Standard 685 $72,375 $66,000
63389 Winfield , MO Standard 7,616 $98,393 $236,900
63390 Wright City , MO Standard 10,970 $82,351 $268,200

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zipcodes.pro. “ZIP codes starting with 633.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/633

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