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/SMALLEST-AREA

Smallest ZIP Codes in Montana by Land Area

What this measures. Land area of the Census tabulation area, smallest first. These are almost always dense urban ZIP codes covering a few city blocks. Source: Census Gazetteer, data release 2026-10-12.

# ZIP City County Land area
1 59623 Helena Lewis and Clark 0.00 sq mi
2 59625 Helena Lewis and Clark 0.09 sq mi
3 59812 Missoula Missoula 0.22 sq mi
4 59851 Milltown Missoula 0.35 sq mi
5 59855 Pablo Lake 0.35 sq mi
6 59231 Saint Marie Valley 0.56 sq mi
7 59841 Pinesdale Ravalli 1.30 sq mi
8 59414 Black Eagle Cascade 1.74 sq mi
9 59919 Hungry Horse Flathead 2.27 sq mi
10 59401 Great Falls Cascade 2.96 sq mi
11 59636 Fort Harrison Lewis and Clark 3.26 sq mi
12 59217 Crane Richland 3.68 sq mi
13 59013 Boyd Carbon 4.31 sq mi
14 59081 Silver Gate Park 4.36 sq mi
15 59863 Ravalli Lake 7.64 sq mi
16 59801 Missoula Missoula 7.71 sq mi
17 59333 Hathaway Rosebud 7.96 sq mi
18 59926 Martin City Flathead 10.04 sq mi
19 59756 Warm Springs Deer Lodge 10.30 sq mi
20 59914 Dayton Lake 11.20 sq mi
21 59076 Sanders Treasure 14.75 sq mi
22 59102 Billings Yellowstone 15.04 sq mi
23 59827 Conner Ravalli 16.27 sq mi
24 59910 Big Arm Lake 19.25 sq mi
25 59933 Stryker Lincoln 19.35 sq mi
26 59856 Paradise Sanders 19.42 sq mi
27 59640 Marysville Lewis and Clark 20.19 sq mi
28 59748 Ramsay Silver Bow 21.28 sq mi
29 59026 Edgar Carbon 22.51 sq mi
30 59867 Saltese Mineral 23.00 sq mi
31 59751 Silver Star Madison 26.92 sq mi
32 59932 Somers Flathead 27.23 sq mi
33 59931 Rollins Lake 28.33 sq mi
34 59848 Lonepine Sanders 30.11 sq mi
35 59007 Bearcreek Carbon 31.67 sq mi
36 59033 Greycliff Sweet Grass 35.36 sq mi
37 59082 Springdale Park 36.73 sq mi
38 59461 Lothair Liberty 37.48 sq mi
39 59240 Glentana Valley 37.60 sq mi
40 59922 Lakeside Flathead 38.23 sq mi
41 59747 Pony Madison 40.12 sq mi
42 59929 Proctor Lake 41.21 sq mi
43 59802 Missoula Missoula 45.38 sq mi
44 59760 Willow Creek Gallatin 45.62 sq mi
45 59273 Vandalia Valley 50.54 sq mi
46 59354 Willard Fallon 51.60 sq mi
47 59913 Coram Flathead 52.14 sq mi
48 59323 Colstrip Rosebud 53.35 sq mi
49 59487 Vaughn Cascade 54.77 sq mi
50 59472 Sand Coulee Cascade 55.37 sq mi

Showing the top 50 of 369 ZIP codes in Montana that have this figure and meet the threshold above. 59623 ranks 1st at 0.00 sq mi, against 55.37 sq mi in 50th place.

Other rankings for Montana

Cite this page

zipcodes.pro. “Smallest ZIP Codes in Montana by Land Area.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/mt/smallest-area

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