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 — RANKINGS/MO/LARGEST-POPULATION

ZIP Codes With the Largest Population in Missouri

What this measures. Population of the Census tabulation area, ACS 5-year estimate. Source: Census American Community Survey, data release 2026-10-12.

# ZIP City County Population
1 63376 Saint Peters St. Charles 74,962
2 65203 Columbia Boone 61,539
3 65807 Springfield Greene 56,659
4 63021 Ballwin St. Louis 55,666
5 63366 O Fallon St. Charles 54,769
6 63301 Saint Charles St. Charles 52,667
7 63129 Saint Louis St. Louis 51,553
8 63385 Wentzville St. Charles 51,330
9 63031 Florissant St. Louis 50,196
10 65201 Columbia Boone 50,011
11 63123 Saint Louis St. Louis 49,077
12 65202 Columbia Boone 47,327
13 63368 O Fallon St. Charles 46,966
14 65802 Springfield Greene 46,739
15 63303 Saint Charles St. Charles 46,089
16 63026 Fenton Jefferson 45,354
17 63017 Chesterfield St. Louis 43,243
18 63304 Saint Charles St. Charles 43,195
19 63033 Florissant St. Louis 43,056
20 65803 Springfield Greene 42,882
21 63116 Saint Louis St. Louis city 42,170
22 64118 Kansas City Clay 41,984
23 63122 Saint Louis St. Louis 41,634
24 65109 Jefferson City Cole 41,145
25 65804 Springfield Greene 40,935
26 63136 Saint Louis St. Louis 40,929
27 63701 Cape Girardeau Cape Girardeau 39,345
28 64068 Liberty Clay 37,758
29 64804 Joplin Newton 37,016
30 65714 Nixa Christian 37,013
31 64801 Joplin Jasper 36,287
32 64133 Kansas City Jackson 36,249
33 64055 Independence Jackson 35,960
34 63011 Ballwin St. Louis 35,920
35 63901 Poplar Bluff Butler 35,324
36 65301 Sedalia Pettis 35,091
37 63010 Arnold Jefferson 34,478
38 63119 Saint Louis St. Louis 34,181
39 63114 Saint Louis St. Louis 33,969
40 65721 Ozark Christian 33,452
41 63125 Saint Louis St. Louis 33,294
42 64119 Kansas City Clay 33,199
43 65401 Rolla Phelps 32,714
44 64015 Blue Springs Jackson 32,245
45 64152 Kansas City Platte 31,545
46 63146 Saint Louis St. Louis 30,678
47 63128 Saint Louis St. Louis 30,540
48 65536 Lebanon Laclede 29,915
49 63367 Lake Saint Louis St. Charles 29,725
50 64012 Belton Cass 29,304

Showing the top 50 of 1,035 ZIP codes in Missouri that have this figure . 63376 ranks 1st at 74,962, against 29,304 in 50th place.

Other rankings for Missouri

Cite this page

zipcodes.pro. “ZIP Codes With the Largest Population in Missouri.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/mo/largest-population

Underlying data is public domain or openly licensed — sources, vintages and licences.