As of the censusGR2 of 2000, there were 20,170 people, 7,864 households, and 5,677 families residing in the city. The population density was 727.8/km² (1,884.4/mi²). There were 8,353 housing units at an average density of 301.4/km² (780.4/mi²).
There were 7,864 households out of which 31.0% had children under the age of 18 living with them, 56.8% were married couples living together, 11.9% had a female householder with no husband present, and 27.8% were non-families. 22.5% of all households were made up of individuals and 9.5% had someone living alone who was 65 years of age or older. The average household size was 2.51 and the average family size was 2.93.
In the city the population was spread out with 23.8% under the age of 18, 6.0% from 18 to 24, 28.6% from 25 to 44, 25.2% from 45 to 64, and 16.4% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 90.6 males. For every 100 females age 18 and over, there were 87.3 males.
The median income for a household in the city was $45,218, and the median income for a family was $52,332. Males had a median income of $39,434 versus $25,918 for females. The per capita income for the city was $20,700. About 4.0% of families and 6.5% of the population were below the poverty line, including 6.2% of those under age 18 and 7.2% of those age 65 or over.