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Sex

Source: U.S. Bureau of the Census, County Population Estimates by Demographic Characteristics - Age, Sex, Race, and Hispanic Origin; updated annually for states and counties. http://www.census.gov/popest/counties/asrh/. 2000 Census of Population and Housing for places; updated every 10 years. http://factfinder.census.gov

Definition:

Sex classification is based on self-identification by gender, either male or female.

The number of females is expressed as a percent of the total population.

Scope and Methodology:

The 2000 data on sex were derived from answers to a question that was asked of all people in Census 2000.

Estimates for states and counties for years after 2000 are developed using a cohort-component method whereby each component of population change - births, deaths, domestic migration, and international migration - is estimated separately for each birth cohort by sex, race, and Hispanic origin.

More Information:

• More methodological information about the state and county estimates
• Projections of the population by age and sex for states
• Other data on women
• Sources of age data (most of which include gender)