Millville, Delaware  Millville is a town in Sussex County, Delaware, United States. The population was 544 at the 2010 census, an increase of 110% from the previous decade. It is part of the Salisbury, Maryland-Delaware Metropolitan Statistical Area and lies within Baltimore Hundred. Millville is located at (38.5495569, -75.1232391), approximately west of the Atlantic Ocean and about south of Indian River Bay. It is contiguous on the east with Ocean View, and bordered on the north, west and south by unincorporated portions of Sussex County. According to the United States Census Bureau, the town has a total area of , all land. At the 2000 census, there were 259 people, 111 households and 71 families residing in the town. The population density was 534.1 per square mile (208.3/km²). There were 141 housing units at an average density of 290.8 per square mile (113.4/km²). The racial make-up of the town was 96.91% White, 1.93% from other races, and 1.16% from two or more races. Hispanic or Latino of any race were 0.77% of the population. There were 111 households of which 23.4% had children under the age of 18 living with them, 58.6% were married couples living together, 4.5% had a female householder with no husband present, and 36.0% were non-families. 31.5% of all households were made up of individuals and 15.3% had someone living alone who was 65 years of age or older. The average household size was 2.33 and the average family size was 2.96.  18.5% of the population were under the age of 18, 7.3% from 18 to 24, 30.1% from 25 to 44, 25.1% from 45 to 64, and 18.9% who were 65 years of age or older. The median age was 42 years. For every 100 females, there were 99.2 males. For every 100 females age 18 and over, there were 101.0 males. The median household income was $36,932 and the median family income was $45,417. Males had a median income of $29,821 and females $22,000. The per capita income was $21,250. None of the families and 1.6% of the population were living below the poverty line, including no under eighteens and 3.8% of those over 64.