High Quality Content by WIKIPEDIA articles! Santa Gertrudis Independent School District (SGISD) is a public school district in Kingsville, Kleberg County, Texas, United States. The district covers approximately 190 square miles (490 km2), and is located in 40 miles (64 km) south of the city of Corpus Christi. SGISD operates Santa Gertrudis Elementary and Academy High School. During the 2009-2010 school year, SGISD had 397 students enrolled, according to Texas Education Agency.