Jackson County is a county located in the U.S. state of Mississippi. As of the 2010 census, the population was 139,668, making it the fifth-most populous county in Mississippi. Its county seat is Pascagoula. The county was named for Andrew Jackson, general in the United States Army and afterward President of the United States.
According to the U.S. Census Bureau, the county has a total area of 1,043 square miles (2,700 km), of which 723 square miles (1,870 km) is land and 321 square miles (830 km) (31%) is water. It is the largest county in Mississippi by total area.
As of the census of 2000, there were 131,420 people, 47,676 households, and 35,709 families residing in the county. The population density was 181 people per square mile (70/km²). There were 51,678 housing units at an average density of 71 per square mile (27/km²). The racial makeup of the county was 75.35% White, 20.87% Black or African American, 0.33% Native American, 1.57% Asian, 0.04% Pacific Islander, 0.72% from other races, and 1.12% from two or more races. 2.14% of the population were Hispanic or Latino of any race.
There were 47,676 households out of which 37.00% had children under the age of 18 living with them, 55.70% were married couples living together, 14.50% had a female householder with no husband present, and 25.10% were non-families. 20.80% of all households were made up of individuals and 7.10% had someone living alone who was 65 years of age or older. The average household size was 2.72 and the average family size was 3.14.
In the county, the population was spread out with 27.70% under the age of 18, 9.30% from 18 to 24, 29.80% from 25 to 44, 22.90% from 45 to 64, and 10.30% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 98.20 males. For every 100 females age 18 and over, there were 95.90 males.
The median income for a household in the county was $39,118, and the median income for a family was $45,091. Males had a median income of $32,996 versus $22,770 for females. The per capita income for the county was $17,768. About 10.50% of families and 12.70% of the population were below the poverty line, including 17.80% of those under age 18 and 12.10% of those age 65 or over.
Jackson County has the fifth highest per capita income in the State of Mississippi.