La Marque is a city in Galveston County, Texas, United States, south of Houston. The city population in 2020 was 18,030. La Marque experienced considerable growth in the 1950s, during which the city provided a general administrative and trades and crafts workforce helping to support the petrochemical complex in adjoining Texas City. It is the hometown of U.S. Senator Kay Bailey Hutchison and Norman Bulaich.

Galveston County is a county in the U.S. state of Texas, located along the Gulf Coast adjacent to Galveston Bay. As of the 2020 census, its population was 350,682. The county was founded in 1838. The county seat is the City of Galveston, founded the following year, and located on Galveston Island. The most-populous municipality in the county is League City, a suburb of Houston at the northern end of the county, which surpassed Galveston in population during the early 2000s.