Not all schools in the US have majors in astronomy (my school didn't), and I'm guessing very few have programs for astrophysics. But my best friend went to a specialized science university, everyone there was studying science or math, so they had an astrophysics major.
Actually, right now she's in graduate school getting her master's in microbiology. She decided she was more interested in viruses than in outer space. ;) I'm not sure what she plans to do when she graduates, maybe work in a lab. However, I remain convinced she's going to discover alternate universes.