Ladies and Gentlemen, they are: At Home.
That's it! No more, no less. They're not at the grocery store or the coffee shop or the gym or the library or a lounge or a sports bar or any of those other places people tell single women to go in search of a mate. No my friends, they are at home.
They're home just like all the decent, single, eligible women are. The most eligible women I know rarely get out and about, mostly because they are gainfully employed and engaged in other life-enriching activities. The same goes for eligible men- they work, they have hobbies, and more than anything else, they have a routine. That routine usually ends with him taking his happy ass home.
This is the reason that many of the prime candidates in the dating pool remain single- they don't get out much. So, instead of joining that dating website or wasting precious time and resources going out night after night, go to your nearest apartment complex and start knocking on some doors.