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3 Recognised Communities
According to the U.S. Census Bureau, the county has a total area of 1,340 km² (517 mi²). 540 km² (208 mi²) of it is land and 800 km² (309 mi²) of it is water. The total area is 59.71% water.
As of the census2 of 2000, there are 71,558 people, 27,784 households, and 20,254 families residing in the county. The population density is 133/km² (343/mi²). There are 32,378 housing units at an average density of 60/km² (155/mi²). The racial makeup of the county is 87.17% White, 2.36% Black or African American, 0.97% Native American, 4.19% Asian, 0.44% Pacific Islander, 1.43% from other races, and 3.44% from two or more races. 3.97% of the population are Hispanic or Latino of any race.
There are 27,784 households out of which 33.30% have children under the age of 18 living with them, 62.20% are married couples living together, 7.80% have a female householder with no husband present, and 27.10% are non-families. 21.50% of all households are made up of individuals and 8.30% have someone living alone who is 65 years of age or older. The average household size is 2.52 and the average family size is 2.93.
In the county, the population is spread out with 25.50% under the age of 18, 8.50% from 18 to 24, 28.00% from 25 to 44, 23.70% from 45 to 64, and 14.30% who are 65 years of age or older. The median age is 37 years. For every 100 females there are 100.40 males. For every 100 females age 18 and over, there are 97.90 males.
The median income for a household in the county is $45,513, and the median income for a family is $51,363. Males have a median income of $35,331 versus $25,612 for females. The per capita income for the county is $21,472. 7.00% of the population and 5.10% of families are below the poverty line. Out of the total people living in poverty, 8.80% are under the age of 18 and 4.40% are 65 or older.