As of the censusGR2 of 2000, there were 6,064 people, 3,049 households, and 2,125 families residing in the city. The population density was 136.0/km² (352.4/mi²). There were 7,075 housing units at an average density of 158.7/km² (411.2/mi²).
There were 3,049 households out of which 10.7% had children under the age of 18 living with them, 65.3% were married couples living together, 3.2% had a female householder with no husband present, and 30.3% were non-families. 25.9% of all households were made up of individuals and 14.7% had someone living alone who was 65 years of age or older. The average household size was 1.99 and the average family size was 2.33.
In the city the population was spread out with 10.1% under the age of 18, 1.7% from 18 to 24, 12.4% from 25 to 44, 35.8% from 45 to 64, and 40.0% who were 65 years of age or older. The median age was 60 years. For every 100 females there were 90.6 males. For every 100 females age 18 and over, there were 88.9 males.
The median income for a household in the city was $79,044, and the median income for a family was $92,455. Males had a median income of $40,641 versus $27,481 for females. The per capita income for the city was $66,912. About 2.0% of families and 3.2% of the population were below the poverty line, including 2.8% of those under age 18 and 1.5% of those age 65 or over.