It's only around 6000 students, but Missouri S&T (a mostly engineering and mining school) is still like 75% male.

There are a few. Harvard 51/49 F/M, UC Berkeley 52/48, Cornell 51/49, Princeton 47/53, Chicago 47/53.

Highly selective STEM schools are both coed and close to 50/50 for undergrads!

* MIT is 49/51 female/male

* Harvey Mudd is 50/50

* Caltech is 43/57 (the exception, I guess)

* Olin is 52/48

Of course, these schools are not feasible options for most people but it is still a relevant counterexample.