Valparaiso is located at . As of the census of 2000, there were 27,428 people, 10,867 households, and 6,368 families residing in the city. The population density was 971.6/km sq (2,515.4/mi sq). There were 11,559 housing units at an average density of 409.4/km sq (1,060.1/mi sq). The racial makeup of the city was 94.35% White, 1.60% African American, 0.23% Native American, 1.49% Asian, 0.02% Pacific Islander, 0.79% from Race (United States Census)other races, and 1.52% from two or more races. Hispanic or Latino of any race were 3.34% of the population.
There were 10,867 households out of which 28.8% had children under the age of 18 living with them, 45.9% were Marriagemarried couples living together, 9.7% had a female householder with no husband present, and 41.4% were non-families. 33.4% of all households were made up of individuals and 10.9% had someone living alone who was 65 years of age or older. The average household size was 2.27 and the average family size was 2.93.
In the city the population was spread out with 21.2% under the age of 18, 17.4% from 18 to 24, 28.1% from 25 to 44, 20.2% from 45 to 64, and 13.1% who were 65 years of age or older. The median age was 33 years. For every 100 females there were 91.8 males. For every 100 females age 18 and over, there were 88.5 males.
The median income for a household in the city was $45,799, and the median income for a family was $60,637. Males had a median income of $46,452 versus $26,544 for females. The per capita income for the city was $22,509. About 4.8% of families and 9.1% of the population were below the poverty line, including 8.1% of those under age 18 and 7.5% of those age 65 or over.