You can't restrict Salt Lake City to one zip code. First of all that's downtown and doesn't truly represent where the babes are. Second of all Salt Lake City in this context really is talking about the wasatch front, which is the combination of 60 miles or so of cities near salt lake city. Also like said above, the girls aren't on dating web sites because the culture here doesn't require it because you already know and meet everybody through church.
Selective breeding those traits for hundreds of years? LOL dude so it's only the mormons who mate with attractive females I guess. The real reason is the genetic diversity is HUGE in salt lake. People moved there from literally all over the world over the span of a hundred years (and to this day of course) with the basic intent of joining the culture. Unlike many other 'melting pots' where immigrants move into the 'towns' section where they stick to their race (looking at you china town/korea town/irish town/etc at new york). Most of the people originally came from every western european and scandinavian country and their combined genes make todays average Utahn. We all know genetic diversity makes attractive people. Also women in utah grew up in big loving families and desire to have one of their own, they're not scared of ruining their body or career. And they're perfectly available to you if you can win one over, believe it or not they're capable of deciding on a partner. Nobody will step in and forbid it (although you may hear some grumblings from the grandparents generation).