Turns out by working through Data.gov I got to the "data cube" showing federal employment (at OPM)--Iowa has 158 Federal employees out of roughly 5000 FSA federal employees. Don't know how many county employees FSA has. A search of FSA notices doesn't produce the answer nor does a Google search. So I stooped to Ask FSA.
Now if data.gov only had the payments by state I might be able to compare the productivity of "private" crop insurance and the "Federal" government. Dream on, I guess.
BTW, I think "data cubes" is a poor term to inflict on the public--it may be good for data warehousing or data mining, but it doesn't mean much to the layperson.