As of the censusGR2 of 2000, there were 6,408 people, 1,928 households, and 1,284 families residing in the city. The population density was 207.2/km² (536.8/mi²). There were 2,023 housing units at an average density of 65.4/km² (169.5/mi²).
There were 1,928 households out of which 30.6% had children under the age of 18 living with them, 52.1% were married couples living together, 10.4% had a female householder with no husband present, and 33.4% were non-families. 28.1% of all households were made up of individuals and 8.5% 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 2.87.
In the city the population was spread out with 16.8% under the age of 18, 20.1% from 18 to 24, 31.9% from 25 to 44, 20.3% from 45 to 64, and 10.8% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 164.7 males. For every 100 females age 18 and over, there were 181.6 males.
The median income for a household in the city was $39,521, and the median income for a family was $46,411. Males had a median income of $22,267 versus $18,781 for females. The per capita income for the city was $19,934. About 3.1% of families and 6.7% of the population were below the poverty line, including 8.7% of those under age 18 and 5.4% of those age 65 or over.
Commercial aircraft fly into nearby Okaloosa Regional Airport/Eglin Air Force Base, which also serves Fort Walton Beach, Florida. The airport code VPS is taken from the city of Valparaiso.