Are there many dating opportunities in Holmes?

I would say probably not. I do actually know some people who live in Holmes, and if I'm not mistaken, they met their boyfriends or girlfriends out of the area. As I've mentioned elsewhere, it's a low population area and so I wouldn't think there are a lot of singles. Further, there are very few places in Holmes where they can mingle (no bars, only a couple restaurants, definitely nothing resembling a club, et al.).

Dating in Holmes isn't impossible, but you're going to be working with a limited pool of candidates, and there's pretty much nowhere to meet them in town.