Source: U.S. Bureau of the Census, Population Estimates Program (PEP). Updated annually. http://www.census.gov/popest/estimates.html.
Estimates are made for the United States, states, counties, places, and metropolitan areas within the United States. The timing of estimates and availability of demographic detail vary by geographic level. The schedule of releases is available at http://www.census.gov/popest/schedule.html.
Sex classification is based on self-classification by gender, either male or female.
The number of females is expressed as a percent of the total population.