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Age

Source: U.S. Bureau of the Census, County Population Estimates by Age, Sex, Race, and Hispanic Origin. Updated annually. http://www.census.gov/population/www/estimates/countypop.html

These data are released yearly using July 1 population. The estimates schedule can be accessed at http://www.census.gov/population/www/estimates/estsched.html.

Definitions:

These data are derived from estimates of the resident population of the 50 States and the District of Columbia by single years of age (age 0, 1, 2,....85 and over) for July 1 of the reference year.

Scope and Methodology:

The state estimates 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. The county detail estimates are produced in a second step using a ratio method.

More Information:

• More methodological information about these estimates
• Other age data

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