Jefferson, more or less, is Delaware’s state medical school(I think they get 20 or so positions); it’s also a huge school, which probably explains the many, many applicants.
And for years the DC schools have been at the top of the list, to the point where at one time or another, both GU and GWU more or less bragged about being the most expensive medical school in the country, after all DC schools lost government support back in the 80s.