The Political Graveyard: Castro County - Lists politicians who lived or died in the county. Capitol Impact: Castro County - Political, economic, and educational data. Butterflies of Castro County, Texas - Information about and pictures of all the known species of butterflies in the county. Castro County, Texas - TXGenWeb Project - USGen Web project - Castro County. Handbook of Texas Online: Castro County - Current and historical information about Castro County. Castro County Government - Features news, courts, and offices. Castro County Appraisal District - Provides forms, property search, and contacts.