From the CDC (http://www.cdc.gov/hiv/topics/surveillance/basic.htm)
At the end of 2006, an estimated 1,106,400 persons (95% confidence interval 1,056,400-1,156,400) in the United States were living with HIV infection, with 21% undiagnosed.
From the CDC (http://www.cdc.gov/hiv/topics/women/resources/factsheets/women.htm)
26% Female, 74% Male
go to CDC website you will get all the info