Are there more blondes or brunettes in the US?

Yes, but I think it's equal because some brunettes are dyeing their hair blonde/ some blondes are dying their hair brunette.

I agree but for a different reason for instance how are we supposed to know that there isn't some hideous blonde or brunette hiding somewhere in the world and then there's some gorgeous blonde or brunette

I believe that there are more brunettes because most people don't like the hair-color blonde so they tend to change it! Everyone loves darker hair most people. Coming from a real blonde