Port Isabel is a city in Cameron County, Texas, United States. It is part of the Brownsville–Harlingen–Raymondville and the Matamoros–Brownsville metropolitan areas.
Established as a town after the Mexican revolution, the city became an important cotton export port before the Civil War. The harbor, town and lighthouse all were fought over and exchanged hands during the Civil War. The town’s name is also attached to the Port Isabel Detention Center located in nearby Los Fresnos.
As of the census of 2000, there were 4,965 people, 1,649 households, and 1,225 families residing in the city. The population density was 2,215.5 people per square mile (853.8/km²). There were 2,055 housing units at an average density of 935.8 per square mile. The median income for a household in the city was $25,323, and the median income for a family was $26,077.
Children living in Port Isabel are zoned to schools in Point Isabel Independent School District. Children go to Garriga Elementary School (Grades K-2), Derry Elementary School, (3-5), Port Isabel Junior High School (6-8), and Port Isabel High School (9-12). All of the schools are located in the city. The mascot of both the junior high and high school is the Tarpon. In addition, children may apply to schools in South Texas Independent School District. The Port Isabel Public Library serves Port Isabel.