As of the census of 2000, there were 45,054 people, 20,736 households, and 11,031 families residing in the city. The population density was 1,628.8/km² (4,220.3/mi²). There were 21,831 housing units at an average density of 789.2/km² (2,045.0/mi²). The racial makeup of the city was 85.28% White, 1.59% African American, 0.53% Native American, 7.80% Asian, 0.20% Pacific Islander, 1.69% from other races, and 2.92% from two or more races. Hispanic or Latino of any race were 4.11% of the population.
There were 20,736 households out of which 23.3% had children under the age of 18 living with them, 42.0% were married couples living together, 8.1% had a female householder with no husband present, and 46.8% were non-families. 35.6% of all households were made up of individuals and 6.7% had someone living alone who was 65 years of age or older. The average household size was 2.13 and the average family size was 2.80.
In the city the population was spread out with 18.5% under the age of 18, 9.3% from 18 to 24, 38.1% from 25 to 44, 23.9% from 45 to 64, and 10.2% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 94.8 males. For every 100 females age 18 and over, there were 92.8 males.
The median income for a household in the city was $60,332, and the median income for a family was $73,395. Males had a median income of $50,691 versus $39,737 for females. The per capita income for the city was $38,903. About 3.9% of families and 5.3% of the population were below the poverty line, including 6.3% of those under age 18 and 5.0% of those age 65 or over.