Texas Cooperative Wildlife Collection list of species found in the county.

Information about and pictures of all the known species of butterflies in the county.

Political, economic, and educational data.

Population, demographic, and housing information from the 1990 census. Link to Tiger map of the county.

USGen Web project - Castro County.

Current and historical information about Castro County.

Lists politicians who lived or died in the county.

Castro County, Texas public record information.