Coldwell Banker Residential Brokerage can help you find Harlingen High School South, Mercedes, TX homes for sale. Refine your Harlingen High School South real estate search results by price, property type, bedrooms, baths and other features. Need more information? View Coldwell Banker Residential Brokerage Mercedes real estate agents or offices and let us help you find the perfect property. We also have area guides that show more information about properties in Mercedes, TX.