Texas State Data Center: Center for the distribution of Texas Census information.
US Census Bureau: Federal, State, & Local Governments: The Census of Governments identifies the scope and nature of the nation's state and local government sector; provides authoritative benchmark figures of public finance and public employment; classifies local government organizations, powers, and activities; and measures federal, state, and local fiscal relationships.
Center for Public Policy Priorities (CPPP): a nonpartisan and nonprofit policy institue in Texas. You can find research reports, facts and statistical data on this site on a wide range of issues that concern Texans.