There were 4,230 households out of which 17.4% had children under the age of 18 living with them, 45.1% were married couples living together, 6.4% had a female householder with no husband present, and 45.1% were non-families. 35.4% of all households were made up of individuals and 16.0% had someone living alone who was 65 years of age or older. The average household size was 2.02 and the average family size was 2.58.
In the city the population was spread out with 15.3% under the age of 18, 6.5% from 18 to 24, 25.2% from 25 to 44, 28.4% from 45 to 64, and 24.5% who were 65 years of age or older. The median age was 47 years. For every 100 females there were 93.1 males. For every 100 females age 18 and over, there were 92.3 males.
The median income for a household in the city was $46,396, and the median income for a family was $61,036. Males had a median income of $48,606 versus $30,189 for females. The per capita income for the city was $30,835. About 6.3% of families and 9.0% of the population were below the poverty line, including 10.5% of those under age 18 and 4.8% of those age 65 or over.
The population had a wave of expansion starting in the 1980s after completion of wastewater treatment facilities expansion designed by Kennedy Jenks Engineers, which infrastructure had previously limited population growth.
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