| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| J and M Trailer Court | city | Montana | United States | 47.14722 | -110.22361 | 4317 | 104 |
| Jackson | city | Montana | United States | 45.36806 | -113.40806 | 6548 | 19 |
| Janney | city | Montana | United States | 45.90944 | -112.49444 | 6043 | 1535 |
| Jardine | city | Montana | United States | 45.07 | -110.63361 | 7001 | 93 |
| Jeffers | city | Montana | United States | 45.34889 | -111.70472 | 4980 | 70 |
| Jefferson City | city | Montana | United States | 46.38833 | -112.02667 | 4757 | 266 |
| Jefferson Island | city | Montana | United States | 45.85083 | -111.93972 | 4379 | 139 |
| Jefferson historical | city | Montana | United States | 45.9 | -111.54167 | 4078 | 213 |
| Jellison Place | city | Montana | United States | 46.67333 | -110.07139 | 6000 | 87 |
| Jennings | city | Montana | United States | 48.36556 | -115.34361 | 3349 | 160 |
| Jens | city | Montana | United States | 46.60417 | -113.00528 | 4120 | 50 |
| Jerry Mallo Trailer Court | city | Montana | United States | 46.54889 | -110.90833 | 5065 | 42 |
| Jessup | city | Montana | United States | 48.21111 | -114.12722 | 2985 | 1734 |
| Jette | city | Montana | United States | 47.7175 | -114.19056 | 2913 | 899 |
| Jimtown | city | Montana | United States | 45.67889 | -106.6875 | 3300 | 192 |
| Jitney historical | city | Montana | United States | 47.02083 | -108.02611 | 2949 | 14 |
| Johnson | city | Montana | United States | 45.79639 | -112.68528 | 6000 | 42 |
| Johnstown historical | city | Montana | United States | 47.50278 | -111.31667 | 3398 | 38359 |
| Joliet | city | Montana | United States | 45.48528 | -108.96972 | 3884 | 444 |
| Joplin | city | Montana | United States | 48.56083 | -110.77167 | 3280 | 55 |
| Jordan | city | Montana | United States | 47.32083 | -106.90944 | 2634 | 14 |
| Jordan Crossing | city | Montana | United States | 48.50722 | -107.28667 | 2201 | 28 |
| Judith Gap | city | Montana | United States | 46.67722 | -109.75111 | 4566 | 49 |
| Judith historical | city | Montana | United States | 47.71806 | -109.64222 | 2746 | 37 |
| Julian historical | city | Montana | United States | 48.9425 | -105.35833 | 2457 | 56 |
| Junction | city | Montana | United States | 45.32361 | -111.99639 | 5574 | 64 |
|
|