HRSA is pleased to present Women’s Health USA 2011, the tenth edition of the Women’s Health USA data book. To reflect the ever-changing, increasingly diverse population and its characteristics, Women’s Health USA selectively highlights emerging issues and trends in women’s health. Data and information on second-hand tobacco smoke exposure, preconception health, oral health care, and barriers to health care are a few of the new topics included in this edition. In addition, new special population features present data on the health of lesbian and bisexual women, as well as the indigenous populations of American Indian and Alaska Native women and Native Hawaiian and other Pacific Islander women. Disparities by sex, race and ethnicity, and socioeconomic factors, including education and income, are highlighted throughout the document where possible. Where race and ethnicity data are reported, groups are mutually exclusive (i.e., non-Hispanic race groups and the Hispanic ethnic group) except in a few cases where the original data are not presented separately. Throughout the data book, those categorized as being of Hispanic ethnicity may be of any race or combination of races. In some instances, it was not possible to provide data for all races due to the design of the original data source or the size of the sample population; therefore, estimates with a relative standard error of 30 percent or greater were considered unreliable and were not reported.