I was curious as to what percentage of Focus sales each bodystyle makes up in the US, so I searched autotrader and found this. Just as I guessed the sedan is the most popular followed by the 3dr hatch, then the wagon and 5 door hatch:
3dr: 4,955
4dr: 14,470
5dr: 1,625 wgn: 2,508
I find it interesting how you hardly ever see sedans in Europe (I went to Italy back in 2003 for about a week and din't see any) but over here the sedans are the most popular bodystyle.