High Quality Content by WIKIPEDIA articles! Sacred Heart High School is a private, Roman Catholic high school in Hallettsville, Texas. It is located in the Roman Catholic Diocese of Victoria in Texas.Sacred Heart was established as an all-girls boarding school by the Sisters of the Incarnate Word and Blessed Sacrament in 1882. Boys were admitted in 1892. The high school portion of the school was closed in 1926 and reopened in 1948. Hallettsville is a city in Lavaca County, Texas, United States. The population was 2,345 at the 2000 census. It is the county seat of Lavaca County. The town is home to the Texas Championship Domino Hall of Fame and also hosts a dominoes tournament every year in January. It also hosts its annual Kolache Fest and Fiddler's Frolic events every September and April.