The Washington Post recently posted a report called Top Secret America that looks at the proliferation of government organizations (many related to intelligence gathering) that require top-secret clearance and are largely unknown by the public and even many officials. Not surprisingly, the largest concentration is outside Washington, D.C.:

All of these places exist just outside Washington in what amounts to the capital of an alternative geography of the United States, one defined by the concentration of top-secret government organizations and the companies that do work for them. This Fort Meade cluster is the largest of a dozen such clusters across the United States that are the nerve centers of Top Secret America and its 854,000 workers.

Debate about the role of intelligence in protecting the country occurs only when something goes wrong and the government investigates, or when an unauthorized disclosure of classified information turns into news.

The existence of these clusters is so little known that most people don’t realize when they’re nearing the epicenter of Fort Meade’s, even when the GPS on their car dashboard suddenly begins giving incorrect directions, trapping the driver in a series of U-turns, because the government is jamming all nearby signals.

The site has an interactive map where you can see the locations of government (red) and associated private company (blue) locations:

You can also look at networks between agencies and companies working on different programs. Here’s some info on top-secret weapons development:

Types of work the CIA does:

There’s a database where you can look up contracted companies for each program or type of work, including location, who they work with, annual revenues, and more.

According to the editor, they spent two years on the investigation and each location is corroborated by at least two public records. They also talked to government officials about security concerns:

Because of the nature of this project, we allowed government officials to see the Web site several months ago and asked them to tell us of any specific concerns. They offered none at that time. As the project evolved, we shared the Web site’s revised capabilities. Again, we asked for specific concerns. One government body objected to certain data points on the site and explained why; we removed those items. Another agency objected that the entire Web site could pose a national security risk but declined to offer specific comments.

We made other public safety judgments about how much information to show on the Web site. For instance, we used the addresses of company headquarters buildings, information which, in most cases, is available on companies’ own Web sites, but we limited the degree to which readers can use the zoom function on maps to pinpoint those or other locations.

I would think there would be ultra-super-mega top-secret locations that their investigation couldn’t uncover because there wouldn’t be public records about them.