Clay County limestone mine became SubTropolis business park

From limestone mine to business park

A Missouri asphalt company began mining limestone in Clay County in 1945. The mine later became SubTropolis, an underground business park that now has more than 2,000 workers and over 10 miles of roads.

An underground workplace

SubTropolis is described as a business park below ground, using the space created by limestone mining for business operations. Its road network stretches for more than 10 miles, giving the site an internal transportation system.

The site’s history connects a mining operation started in 1945 with a large modern workplace in Clay County. The development reflects how an area first used to extract limestone now serves businesses and workers.

What the numbers show

More than 2,000 people work at SubTropolis. The underground park also contains more than 10 miles of roads, making its scale measurable both by employment and by the size of its internal road system.

The historical development is straightforward: limestone mining began in 1945, and the mine is now known as SubTropolis. The site’s present use is an underground business park rather than only a mining operation.