I live in a Dutch community and am attracted to tall guys with blond hair and blue eyes. So...about 75% of them are physically attractive enough...however, I'm related to about half of the population of my town, so...about 20% are acceptable to date.
In the area where I live, seriously, it has to be above 40-50%. I am thinking in terms of smaller samples. Whenever I see a group of 4 girls / women at a place like the train or the mall or a park, I find 2 of them attractive enough. Even at work, almost half o the girls who get hired are datable. I never felt that way in the north east. These Latinas are hot at looks and warm at heart.
For some reason I'm very picky when it comes to physical attractiveness. In my area in Finland from girls in an age range of about 18-23 10 to 15 maybe 20%. Don't know if it goes up or down when I go to university, hopefully up :)
I live in the Colorado mountains, and almost everyone is quite physically active and "outdoorsy.". I couldn't assign a percentage number, but, it's definitely higher than it is in the huge eastern US cities I used to live in, and it's directly related to fitness level.