A PDF map of the state with the county boundaries and names.
Includes county boundaries, major highways and county seats in PDF format. You'll need the Adobe Acrobat Reader to view it.
Need to know where a county can be found? Try this interactive map provided by the Texas Association of Counties' County Information Project.
MapStats
Locate a County by Place Name. Enter a city or town and this utility will tell you in what county it is located. Provided by FedStats, official statistical information produced by the Federal Government.