2020 census As of the
2020 census, La Marque had a population of 18,030, 6,707 households, and 4,229 families. The median age was 38.6 years. 23.6% of residents were under the age of 18 and 16.8% of residents were 65 years of age or older. For every 100 females there were 91.7 males, and for every 100 females age 18 and over there were 89.2 males age 18 and over. There were 6,707 households in La Marque, of which 33.8% had children under the age of 18 living in them. Of all households, 42.0% were married-couple households, 18.0% were households with a male householder and no spouse or partner present, and 32.3% were households with a female householder and no spouse or partner present. About 24.8% of all households were made up of individuals and 11.1% had someone living alone who was 65 years of age or older. There were 7,318 housing units, of which 8.3% were vacant. The homeowner vacancy rate was 2.3% and the rental vacancy rate was 8.5%.
2000 census As of the
census of 2000, 13,682 people, 5,237 households, and 3,713 families resided in the city. The population density was . The 5,732 housing units averaged 403.0 per square mile (155.6/km2). The
racial makeup of the city was 55.84% White, 34.69% African American, 0.46% Native American, 0.47% Asian, 6.24% from other races, and 2.31% from two or more races. Hispanics or Latinos of any race were 15.43% of the population. Of the 5,237 households, 30.4% had children under the age of 18 living with them, 48.3% were married couples living together, 17.2% had a female householder with no husband present, and 29.1% were not families. About 24.7% of all households were made up of individuals, and 10.7% had someone living alone who was 65 years of age or older. The average household size was 2.58 and the average family size was 3.06. In the city, the age distribution was 25.7% under 18, 9.0% from 18 to 24, 26.2% from 25 to 44, 23.5% from 45 to 64, and 15.6% who were 65 or older. The median age was 38 years. For every 100 females, there were 90.4 males. For every 100 females 18 and over, there were 86.9 males. The median income for a household in the city was $34,841, and for a family was $39,081. Males had a median income of $32,099 versus $27,292 for females. The
per capita income for the city was $17,518. About 13.5% of families and 17.5% of the population were below the
poverty line, including 26.6% of those under age 18 and 9.8% of those age 65 or over. ==Government and infrastructure==