were 31,894 people, 13,324 households, and 8,201 families residing in the city. The population density was . There were 14,057 housing units at an average density of . The racial makeup of the city was 93.9% White, 0.3% African American, 1.7% Native American, 0.8% Asian, 0.1% Pacific Islander, 0.7% from other races, and 2.4% from two or more races. Hispanic or Latino of any race were 2.8% of the population. There were 13,324 households, of which 27.8% had children under the age of 18 living with them, 47.0% were married couples living together, 10.3% had a female householder with no husband present, 4.3% had a male householder with no wife present, and 38.4% were non-families. 30.2% of all households were made up of individuals, and 12.8% had someone living alone who was 65 years of age or older. The average household size was 2.32 and the average family size was 2.87. The median age in the city was 39.9 years. 21.5% of residents were under the age of 18; 10.8% were between the ages of 18 and 24; 23.8% were from 25 to 44; 25.6% were from 45 to 64; and 18.2% were 65 years of age or older. The gender makeup of the city was 49.2% male and 50.8% female. 2000 census As of the census of 2000, there were 30,905 people, 12,795 households, and 8,278 families residing in the city. The population density was . There were 13,394 housing units at an average density of . The racial makeup of the city was 95.14% White, 0.30% African American, 1.59% Native American, 0.76% Asian, 0.08% Pacific Islander, 0.51% from other races, and 1.61% from two or more races. Hispanic or Latino of any race were 1.91% of the population. There were 12,795 households, out of which 28.7% included children under the age of 18, 51.3% were married couples living together, 9.3% had a female householder with no husband present, and 35.3% were non-families. 27.9% of all households were made up of individuals, and 12.0% were a single person living alone who was 65 years of age or older. The average household size was 2.36 and the average family size was 2.88. In the city, the population was spread out, with 23.3% under the age of 18, 10.7% from 18 to 24, 26.7% from 25 to 44, 22.3% from 45 to 64, and 17.0% who were 65 years of age