Hallettsville is a city in Lavaca County, Texas, United States. The population was 2,550 at the 2010 census. It is the county seat of Lavaca County.
Hallettsville is named for an early founding family that colonized this area. John Hallett had received a land grant from Stephen F. Austin in 1831 and after his death in 1836 his wife, Margaret Hallett, donated the land for the town's location.
A few of the early settlers of the Hallettsville area include Collatinus Ballard, M. B. Bennett, A. W. Hicks, David Ives, Ira McDaniel, and William Smeathers.
Hallettsville is located at 29°26′43″N 96°56′27″W (29.445398, −96.940734).
According to the United States Census Bureau, the city has a total area of 2.2 square miles (5.7 km2), all of it land.
As of the census of 2000, there were 2,345 people, 1,019 households, and 627 families residing in the city. The population density was 1,051.0 people per square mile (406.0/km2). There were 1,223 housing units at an average density of 548.1 per square mile (211.8/km2). The racial makeup of the city was 77.10% White, 16.46% Black, 0.17% Native American, 0.17% Asian, 4.48% from other races, and 1.62% from two or more races. Hispanic or Latino of any race were 11.17% of the population.