As of the census of 2000, there were 675 people, 233 households, and 170 families residing in the city. The population density was 1,407.3 people per square mile (543.0/km²). There were 260 housing units at an average density of 542.1 per square mile (209.1/km²). The racial makeup of the city was 81.04% White, 1.19% African American, 7.11% Native American, 0.59% Asian, 0.15% Pacific Islander, 3.41% from other races, and 6.52% from two or more races. Hispanic or Latino of any race were 7.41% of the population. 18.6% were of German, 6.8% American, 6.6% Norwegian, 5.6% Irish and 5.1% European ancestry. There were 233 households out of which 42.9% had children under the age of 18 living with them, 50.6% were married couples living together, 14.6% had a female householder with no husband present, and 27.0% were non-families. 21.9% of all households were made up of individuals and 9.0% had someone living alone who was 65 years of age or older. The average household size was 2.90 and the average family size was 3.35. In the city, the population was spread out with 34.4% under the age of 18, 6.8% from 18 to 24, 27.4% from 25 to 44, 20.9% from 45 to 64, and 10.5% who were 65 years of age or older. The median age was 32 years. For every 100 females, there were 96.8 males. For every 100 females age 18 and over, there were 92.6 males. The median income for a household in the city was $30,357, and the median income for a family was $32,500. Males had a median income of $32,431 versus $23,214 for females. The per capita income for the city was $13,428. About 17.5% of families and 18.6% of the population were below the poverty line, including 25.7% of those under age 18 and 23.1% of those age 65 or over. In the first few decades of Oakville, the area had a booming trade in lumber, with logging and mills providing a flourishing foundation to the economy, and with many other businesses springing up to sell to the workers these trades brought in.