As of the census of 2000, there were 34,660 people, 14,066 households, and 8,931 families residing in the city. The population density was 2,530.0 people per square mile (976.8/km²). There were 15,225 housing units at an average density of 1,111.4/sq mi (429.1/km²). The racial makeup of the city was 89.35% White, 0.72% African American, 1.76% Native American, 2.17% Asian, 0.13% Pacific Islander, 2.96% from other races, and 2.92% from two or more races. Hispanic or Latino of any race were 5.82% of the population. 17.3% were of German, 11.2% English, 10.3% United States or American, 8.5% Irish and 7.3% Norwegian ancestry according to Census 2000. 92.4% spoke English and 4.9% Spanish as their first language.
There were 14,066 households out of which 30.9% had children under the age of 18 living with them, 46.5% were married couples living together, 12.3% had a female householder with no husband present, and 36.5% were non-families. 30.1% of all households were made up of individuals and 12.4% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average family size was 2.96.
In the city the population was spread out with 26.0% under the age of 18, 8.9% from 18 to 24, 27.1% from 25 to 44, 22.6% from 45 to 64, and 15.4% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 93.2 males. For every 100 females age 18 and over, there were 90.0 males.
The median income for a household in the city was $35,171, and the median income for a family was $43,869. Males had a median income of $38,972 versus $26,625 for females. The per capita income for the city was $18,559. About 12.3% of families and 16.7% of the population were below the poverty line, including 25.0% of those under age 18 and 6.8% of those age 65 or over.