Texas Fact Book 2012 - produced by the Texas Legislative Budget Board, this source gives state population tables and compiles the information into charts and graphs. NOTE: requires installation of Acrobat Reader.
Texas State Data Center - includes population figures and trends at the state, county and metropolitan area level from the University of Texas at San Antonio.
Texas Finances and Economic Reporting - the Texas Comptroller of Public Accounts provides economic figures, such as unemployment, and gives projections. Regional, as well as state, figures are available.