The Texas State Population Estimates and Projections Program's projections of the population of Texas and of each county in Texas were prepared by personnel from the Office of the State Demographer and the Texas State Data Center in the Institute for Demographic and Socioeconomic Research at the University of Texas at San Antonio.
These projections are of the population of the State and of all counties in the State for each year from 2000 through 2040.
Texas State Data Center: http://txsdc.utsa.edu
Tables for Texas Population Projections: http://txsdc.utsa.edu/Data/TPEPP/Projections/2008/
The data provided (above) by the Texas State Data Center does not limit population estimates to the voting eligible population (citizens over the age of 18).
The UT Arlington Library, in cooperation with Dr. Gutierrez, used the Texas State Data Center's projections to calculate voting eligible projections, specifically for the Hispanic voter populations.