According to the U.S. Census Bureau, the county has a total area of 3,293 km² (1,271 mi²). 2,566 km² (991 mi²) of it is land and 726 km² (280 mi²) of it is water. The total area is 22.06% water.
As of the census2 of 2000, there are 186,742 people, 74,563 households, and 50,851 families residing in the county. The population density is 73/km² (188/mi²). There are 94,234 housing units at an average density of 37/km² (95/mi²). The racial makeup of the county is 97.56% White, 0.42% Black or African American, 0.24% Native American, 0.73% Asian, 0.03% Pacific Islander, 0.17% from other races, and 0.85% from two or more races. 0.70% of the population are Hispanic or Latino of any race.
There are 74,563 households out of which 32.20% have children under the age of 18 living with them, 55.00% are married couples living together, 9.50% have a female householder with no husband present, and 31.80% are non-families. 24.90% of all households are made up of individuals and 9.70% have someone living alone who is 65 years of age or older. The average household size is 2.47 and the average family size is 2.96.
In the county the population is spread out with 24.80% under the age of 18, 6.90% from 18 to 24, 30.00% from 25 to 44, 24.80% from 45 to 64, and 13.60% who are 65 years of age or older. The median age is 38 years. For every 100 females there are 94.50 males. For every 100 females age 18 and over, there are 91.40 males.
The median income for a household in the county is $43,630, and the median income for a family is $51,419. Males have a median income of $36,317 versus $26,016 for females. The per capita income for the county is $21,225. 8.20% of the population and 5.90% of families are below the poverty line. Out of the total people living in poverty, 9.90% are under the age of 18 and 8.50% are 65 or older.
Cities and towns