The county is part of the Beaumont–Port Arthur Metropolitan Statistical Area.
As of the census of 2000, there were 252,051 people, 92,880 households, and 63,808 families residing in the county. The population density was 279 people per square mile (108/km²). There were 102,080 housing units at an average density of 113 per square mile (44/km²). The racial makeup of the county was 57.24% White, 33.74% Black or African American, 0.34% Native American, 2.89% Asian, 0.03% Pacific Islander, 4.26% from other races, and 1.50% from two or more races. 10.53% of the population were Hispanic or Latino of any race. 8.3% were of American, 7.2% French, 6.2% German, 5.8% English and 5.3% Irish ancestry according to Census 2000.
There were 92,880 households out of which 33.00% had children under the age of 18 living with them, 48.40% were married couples living together, 16.20% had a female householder with no husband present, and 31.30% were non-families. 27.30% of all households were made up of individuals and 11.00% had someone living alone who was 65 years of age or older. The average household size was 2.55 and the average family size was 3.12.
In the county, the population was spread out with 25.90% under the age of 18, 10.00% from 18 to 24, 29.30% from 25 to 44, 21.10% from 45 to 64, and 13.60% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 101.10 males. For every 100 females age 18 and over, there were 100.20 males.
The median income for a household in the county was $34,706, and the median income for a family was $42,290. Males had a median income of $36,719 versus $23,924 for females. The per capita income for the county was $17,571. About 14.60% of families and 17.40% of the population were below the poverty line, including 24.60% of those under age 18 and 11.80% of those age 65 or over.