Population Data

Population data for Texas are provided by the Texas State Data Center, Population Estimates and Projections Program .   The Texas State Data Center (TxSDC) web site provides a detailed discussion of its methodology and programs. Texas Health and Human Services Commission (HHSC) is responsible for coordinating population data among HHSC agencies, including Texas Department of State Health Services.

The user of the data presented here should be aware that HHSC and Texas Department of State Health Services use population data from two Texas State Data Center programs, Estimates and Projections.  Briefly, estimates through 1999 are based on revisions of 1990 census data to reflect birth and death trends.  Population estimates for 2001 through 2009 are based on 2000 census data updated to reflect currently available data on births, deaths and other public information. Projections extend from 2010 through 2020;  they are produced using a model of projected births and deaths, rather than actual records. Both estimation and projection models use estimates of migration rates. These estimated migration rates are produced by the TxSDC using several migration scenarios. This results in more than one projection series. HHSC has designated the "2000 - 2007 Scenario" to be the current standard for HHSC agency population projections. See the SDC site for more information on migration scenarios.

Most programs at DSHS use population estimates for the years for which they are available, and  projections for subsequent years (currently 2009 onwards).  Each year, as the State Data Center provides new estimates, based on newly available demographic data, the set of projections for that year is replaced by the new estimates.  In addition, periodically, both the estimates and the projections may be updated for a whole series of years.

Texas Health Data now offers both estimates and projections for all Texas counties by age group, gender and race/ethnicity according to the following schedule.
 

Population Series Years
Estimates 1990 to 1999
Census Counts 2000
Estimates2001 to 2009
Projections 2010
Projections 2011 to 2020

Because these data are produced by different methods, the 2000 census population, the 2001 to 2009 estimates and the 2010 and onward projected population may not follow smoothly from the 1999 estimates.  If the data are to be used in trend analysis, or other comparative treatments,  unexpected results may be obtained if data from both estimated and projected series are used.

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Last Updated November 19, 2010.