User blog comment:Frodo the 9 fingered/A Third Camp?/@comment-5090305-20121206114410

I'm gonna throw in my two cents, even though it's a little late. Logically, there could easily be another "camp", though it would likely be a much smaller division than the other two. Remember that ancient Greece was divided into many city states with different values, who, unlike the Camp Half-Blood residents, almost never got along with each other. The Macedonians, the Spartans, the Mycenaeans, ect. The books hardly mention this division, but it is easily possible for a sub-division within the Greeks. However, I don't know if Riordan would throw that into the mix.

And I mean a sub-division aside from the leftover demigods from the Titan army.