Girls were a rarity when I played during junior-high... I remember a regional tournament where a team with a girl player showed up, and everybody was oooing and ahhing as if she were some sort of exotic specimen. I imagine that's changed by now, but in the late 1970s--in Indiana, anyway--it was an overwhelmingly male arena of competition.
US Woman's Olympic team which took home a Silver medal.
Top three boards were born abroad, but they're all Americans now. I know Anna Zatonskih of Bowling Green, Ohio personally. Even played chess with her in her apartment. Her husband's a great dude. Irina Krush has a boyfriend...
http://www.chessbase.com/eventarticle.asp?newsid=1953