Sources: U.S. Census Bureau, Population Estimates Program (PEP). Updated annually. Population and Housing Unit Estimates
U.S. Census Bureau, American Community Survey (ACS). Updated annually. American Community Survey
The number of females is expressed as a percent of the total population.
Population Estimates Program
Sex estimates of the population are produced for the United States, states, and counties, as well as for the Commonwealth of Puerto Rico and its municipios (county-equivalents for Puerto Rico). Sex is based on the biological attributes of men and women (chromosomes, anatomy, and hormones).
For more information, go to Age and Sex
Data users should also be aware of methodology differences that may exist in the creation of these estimates. For more information, go to Methodology for U.S. and Puerto Rico
American Community Survey
Sex estimates of the population are produced for places, zona urbanas and comunidades (place-equivalents for Puerto Rico), and minor civil divisions. The sex data collected on the forms are aggregated and provide the number of males and females in the population. These data are needed to interpret most social and economic characteristics used to plan and analyze programs and policies. Data about sex are critical because so many federal programs must differentiate between males and females.
For more information, go to ACS subject definitions "Sex"
Data users should be aware of methodology differences that may exist between different data sources.