Well, generally speaking I don't know where any of neighbors work, except for one who happens to write for the ComPost. If I did know that my neighbor worked at the CIA however, that would make it a very open secret.
There are lots of people who work for the CIA and aren't covert. I know people who work at the CIA and are not covert, although they don't go around bragging about it or anything. The covert ones say they are consultans at some shell company.