It should be pointed out that women slightly outnumber men pretty much everywhere, it's mostly a matter of just how much they outnumber us by.
More than just male/female ratio should be taken into account. It's easier in places that have an active nightlife, for those who can tolerate the whole bar/club scene at least (I dislike it, but could put up with it, given that it was the environment where people were most receptive to being approached). It doesn't really matter how little competition there is for mates if you're in a place where everyone just goes to work then goes home and there's few opportunities to meet people in the first place. Rather than focusing on how many other men you're competing with for women, better to focus on how many opportunities you have to try.
Also, I've lived in a few cities in Southern California and found that, while the gender ratios are roughly similar, city to city, there are some places where the women (everyone really, but it was the women I was most concerned with) are just plain friendlier and more open to being approached by, or willing to approach, strange men.
A big part of that, I think, can be explained by how safe the area is, or how safe it is perceived to be.
Lived in Riverside, which is pretty much a s**thole. There, nobody talks to anyone unless you're somewhere people specifically go to meet people, bars and the like. Even then, everyone acts very guarded.
Santa Barbara, on the other hand, is quite nice and very safe. There, I'd find myself having conversations with random strangers pretty much anywhere I went.
It's pretty obvious which kind of environment is gonna be more conducive to meeting potential mates. Don't just go places where the women outnumber men, that does you no good if they're all afraid of meeting new men. Instead, go to places where they feel safe, that's where you're gonna have the most success.