First time accepted submitter DERoss writes "The National Science Foundation has published a research paper titled Regional Concentrations of Scientists and Engineers In the United States. The lead paragraph contains the sentence 'The three most populous states — California, Texas, and New York — together accounted for more than one-fourth of all S&E employment in the United States.' According to the 2010 census, however, those three states also contain more than one-fourth (26.5%) percent of the U.S. population. In other words, there is no concentration beyond how the general population is concentrated."
The clustering is studied with finer granularity than the per-state level, though, and the paper names several places (like the Santa Clara area, and Houston) where such jobs are particularly prevalent.