Montana has 6 Army bases: 1.8% of the US total of 332. That ranks #22 by count and #4 per person (0.53 per 100,000 residents) of 51.
Source: DoD Military Installations, Ranges and Training Areas (MIRTA), via the Bureau of Transportation Statistics, 2026. Every active installation the DoD lists under the Army, including its Reserve and National Guard sites, at the centre of its boundary, with its area in acres. Joint bases are listed under the branch that reports them.
Licence: U.S. government data: no copyright, free to reuse
Local blogs, news sites, parks pages: embed the live interactive map with one snippet. Attribution stays on, that's the whole deal.
<iframe src="https://get-instamaps.com/embed/rankings/army-bases/montana" width="100%" height="440" style="border:2px solid #111" loading="lazy" title="Montana army bases map — InstaMaps"></iframe>| # | Name | Details |
|---|---|---|
| 1 | Butte USARC | Army Reserve · 10 acres |
| 2 | Fort Wm Harrison AMSA 75 G | Army Reserve · 13 acres |
| 3 | NG Helena Aviation RC- AASF- C12 | Army National Guard · 60 acres |
| 4 | NG MTA Ft Wm Henry Harrison | Army National Guard · 6,559 acres |
| 5 | NG MTA Limestone Hills | Army National Guard · 42,638 acres |
| 6 | NG TS Waco LTA | Army National Guard · 4,571 acres |
Names as the source gives them. Coordinates for every one are in the CSV.
"Montana has 6 Army bases, #22 in the US by count and #4 per person (DoD Military Installations, Ranges and Training Areas, 2026, mapped by InstaMaps)." Free to quote with a link to this page. Population: US Census 2024 estimates.