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/MOST-TAX-RETURNS

ZIP Codes With the Most Tax Returns Filed in Montana

What this measures. Number of individual income tax returns filed. A rough proxy for how many households a ZIP code contains, available where census figures are not. Source: IRS Statistics of Income, ZIP code data, data release 2026-10-12.

# ZIP City County Returns filed
1 59901 Kalispell Flathead 28,520
2 59102 Billings Yellowstone 24,040
3 59718 Bozeman Gallatin 23,810
4 59101 Billings Yellowstone 19,240
5 59715 Bozeman Gallatin 17,260
6 59105 Billings Yellowstone 16,540
7 59701 Butte Silver Bow 16,210
8 59801 Missoula Missoula 15,780
9 59601 Helena Lewis and Clark 15,400
10 59405 Great Falls Cascade 15,170
11 59602 Helena Lewis and Clark 14,240
12 59404 Great Falls Cascade 13,740
13 59714 Belgrade Gallatin 12,430
14 59808 Missoula Missoula 12,040
15 59106 Billings Yellowstone 10,950
16 59802 Missoula Missoula 10,090
17 59803 Missoula Missoula 8,530
18 59937 Whitefish Flathead 8,280
19 59912 Columbia Falls Flathead 7,890
20 59840 Hamilton Ravalli 7,420
21 59047 Livingston Park 7,260
22 59401 Great Falls Cascade 6,140
23 59044 Laurel Yellowstone 6,000
24 59501 Havre Hill 5,950
25 59870 Stevensville Ravalli 5,790
26 59860 Polson Lake 5,450
27 59301 Miles City Custer 5,240
28 59911 Bigfork Lake 4,840
29 59635 East Helena Lewis and Clark 4,470
30 59457 Lewistown Fergus 4,450
31 59711 Anaconda Deer Lodge 4,400
32 59923 Libby Lincoln 4,370
33 59270 Sidney Richland 4,090
34 59804 Missoula Missoula 4,020
35 59725 Dillon Beaverhead 3,920
36 59330 Glendive Dawson 3,640
37 59828 Corvallis Ravalli 3,230
38 59847 Lolo Missoula 3,100
39 59833 Florence Ravalli 3,040
40 59864 Ronan Lake 2,980
41 59634 Clancy Jefferson 2,850
42 59741 Manhattan Gallatin 2,790
43 59752 Three Forks Gallatin 2,570
44 59417 Browning Glacier 2,510
45 59917 Eureka Lincoln 2,380
46 59644 Townsend Broadwater 2,320
47 59230 Glasgow Valley 2,270
48 59427 Cut Bank Glacier 2,230
49 59068 Red Lodge Carbon 2,110
50 59019 Columbus Stillwater 2,070

Showing the top 50 of 224 ZIP codes in Montana that have this figure . 59901 ranks 1st at 28,520, against 2,070 in 50th place.

Other rankings for Montana

Cite this page

zipcodes.pro. “ZIP Codes With the Most Tax Returns Filed in Montana.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/mt/most-tax-returns

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