It is the largest city in Sussex county and was voted the 28th Best Small Town in America.. It hosted the Seaford Eagles of the Eastern Shore Baseball League.
As of the census of 2000, there were 6,699 people, 2,629 households, and 1,664 families residing in the city. The population density was 1,925.9 people per square mile (743.2/km²). There were 2,809 housing units at an average density of 807.5/sq mi (311.7/km²). The racial makeup of the city was 64.04% White, 30.02% African American, 0.37% Native American, 1.49% Asian, 0.19% Pacific Islander, 1.72% from other races, and 2.16% from two or more races. Hispanic or Latino of any race were 4.25% of the population.
There were 2,629 households out of which 31.5% had children under the age of 18 living with them, 37.8% were married couples living together, 22.3% had a female householder with no husband present, and 36.7% were non-families. 32.1% of all households were made up of individuals and 15.4% had someone living alone who was 65 years of age or older. The average household size was 2.36 and the average family size was 2.95.
In the city the population was spread out with 25.6% under the age of 18, 9.4% from 18 to 24, 24.1% from 25 to 44, 18.9% from 45 to 64, and 22.0% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 77.6 males. For every 100 females age 18 and over, there were 69.8 males.
The median income for a household in the city was $28,402, and the median income for a family was $39,688. Males had a median income of $30,467 versus $23,490 for females. The per capita income for the city was $15,022. About 22.0% of families and 27.6% of the population were below the poverty line, including 43.4% of those under age 18 and 13.2% of those age 65 or over.
US Route 13 is the main north-south thoroughfare within city limits, with Delaware Route 20 being the main east-west highway. US Route 13 connects Seaford with Bridgeville to the north and Laurel to the south as part of the Sussex Highway. State Route 20 connects Seaford with Millsboro to the east and tiny Reliance, Maryland to the west.
The closest airport with commercial air service to Seaford is the Wicomico Regional Airport in Salisbury, Maryland. The closest Public Airport is Western Sussex Airport/Booth Field. west of Laurel Delaware.
Freight rail service in Seaford is provided by two carriers: Norfolk Southern and the Maryland and Delaware Railroad. Norfolk Southern runs north-south through the city, parallel to US 13. It interchanges with the Maryland and Delaware Railroad in Seaford, which heads west to Federalsburg and Cambridge in Maryland.