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/MT/LARGEST-POPULATION

ZIP Codes With the Largest Population in Montana

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 59901 Kalispell Flathead 63,161
2 59102 Billings Yellowstone 47,977
3 59718 Bozeman Gallatin 44,585
4 59101 Billings Yellowstone 42,250
5 59715 Bozeman Gallatin 39,643
6 59105 Billings Yellowstone 35,480
7 59701 Butte Silver Bow 34,232
8 59405 Great Falls Cascade 33,350
9 59601 Helena Lewis and Clark 31,728
10 59801 Missoula Missoula 30,916
11 59602 Helena Lewis and Clark 30,754
12 59404 Great Falls Cascade 28,822
13 59714 Belgrade Gallatin 24,282
14 59808 Missoula Missoula 23,574
15 59106 Billings Yellowstone 21,417
16 59802 Missoula Missoula 19,864
17 59803 Missoula Missoula 18,401
18 59912 Columbia Falls Flathead 15,752
19 59840 Hamilton Ravalli 15,679
20 59937 Whitefish Flathead 15,114
21 59047 Livingston Park 14,092
22 59401 Great Falls Cascade 13,255
23 59870 Stevensville Ravalli 12,506
24 59044 Laurel Yellowstone 12,302
25 59501 Havre Hill 12,243
26 59860 Polson Lake 11,897
27 59301 Miles City Custer 11,643
28 59923 Libby Lincoln 10,450
29 59711 Anaconda Deer Lodge 9,529
30 59911 Bigfork Lake 9,493
31 59457 Lewistown Fergus 9,135
32 59270 Sidney Richland 8,571
33 59725 Dillon Beaverhead 8,343
34 59635 East Helena Lewis and Clark 8,292
35 59330 Glendive Dawson 8,133
36 59804 Missoula Missoula 8,123
37 59417 Browning Glacier 7,470
38 59864 Ronan Lake 7,301
39 59833 Florence Ravalli 6,316
40 59847 Lolo Missoula 6,015
41 59828 Corvallis Ravalli 5,827
42 59741 Manhattan Gallatin 5,748
43 59722 Deer Lodge Powell 5,732
44 59634 Clancy Jefferson 5,521
45 59752 Three Forks Gallatin 5,404
46 59201 Wolf Point Roosevelt 5,073
47 59034 Hardin Big Horn 5,008
48 59427 Cut Bank Glacier 5,008
49 59917 Eureka Lincoln 4,920
50 59072 Roundup Musselshell 4,690

Showing the top 50 of 369 ZIP codes in Montana that have this figure . 59901 ranks 1st at 63,161, against 4,690 in 50th place.

Other rankings for Montana

Cite this page

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

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