• Amphibians and Reptiles in Willacy County - Texas Cooperative Wildlife Collection list of species found in the county.
• Butterflies of Willacy County, Texas - Information about and pictures of all the known species of butterflies in the county.
• Demographic Data - Willacy County - Statistical and demographic information for Willacy County.
• Handbook of Texas Online - Current and historical information about Willacy County.
• The Political Graveyard: Willacy County, Tex. - Information about politicians that lived or died in the county.
• TDCJ Unit Profiles - Willacy County - A profile of the privately-operated jail facility located in Raymondville, with statistical and demographic information.
• United Methodist Churches - Willacy County - A directory of UMC congregations within the county, with a schedule of services, contact and address information.
• 1016west - Web content provider, search engine and local business e-Directory.
• Willacy County - Maintained by The HiLiners, includes a brief history of Willacy County.
• Willacy County Catholic Churches - A directory of Catholic churches within the county, including a profile of each, with photographs, a schedule of services, and address and contact information.
• Willacy County Economically Distressed Areas - Colonias and other distressed areas within the county are listed by location, with maps available for purchase online from the Texas Water Development Board.
• Willacy County Government - A directory of county offices and agencies, with address and contact information, as well as links to those with an Internet presence.
• Willacy County Nature Partners - A nature conservation organization. Includes photographs of rural areas of the county and some of the wildlife found within.
• Willacy County QuickFacts from the US Census Bureau - Population, demographic, and housing information from the 1990 census. Link to Tiger map of the county.
• YBLost - Willacy County - Address and contact information for county agencies and offices, including links to those with an Internet presence.