Hallettsvillebr/Lavaca County, Texasbr/29 26.629' N 96 56.538' W Directions: Start at the intersection of 4th Street and La Grange Street. The marker is on the southwest corner of the intersection.br/ br/Text: Founded 1833 when John Hallett erected a log cabin near Lavaca River. Town was named for his widow, Margaret, who gave the land when town became county seat in 1852. Farming, livestock, poultry processing, and cotton marketing center. State Championship High School Rodeo held annually in June.