Illinois has 5 Army bases: 1.5% of the US total of 332. That ranks #31 by count and #45 per person (0.04 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/illinois" width="100%" height="440" style="border:2px solid #111" loading="lazy" title="Illinois army bases map — InstaMaps"></iframe>| # | Name | Details |
|---|---|---|
| 1 | Joliet USARC/JTA | Army Reserve · 3,576 acres |
| 2 | NG Marseilles (MTA Tng Area) | Army National Guard · 2,565 acres |
| 3 | NG Sparta Armory | Army National Guard · 2,650 acres |
| 4 | NG Springfield (TS Cp Lincoln) | Army National Guard · 209 acres |
| 5 | Rock Island Arsenal | Army · 948 acres |
Names as the source gives them. Coordinates for every one are in the CSV.
"Illinois has 5 Army bases, #31 in the US by count and #45 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.