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According to the U.S. Census Bureau, the county has a total area of 380 square miles (980 km2), of which 349 square miles (900 km2) are land and 31 square miles (80 km2) (8.1%) are covered by water. It is the third-smallest county in Wisconsin by total area.
There were 7,703 households, out of which 29.40% had children under the age of 18 living with them, 58.50% were married couples living together, 6.90% had a female householder with no husband present, and 30.90% were non-families. 27.00% of all households were made up of individuals, and 13.80% had someone living alone who was 65 years of age or older. The average household size was 2.43 and the average family size was 2.96.
In the county, the population was spread out, with 24.20% under the age of 18, 6.60% from 18 to 24, 26.20% from 25 to 44, 24.20% from 45 to 64, and 18.80% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 97.00 males. For every 100 females age 18 and over, there were 95.20 males.
In 2017, there were 380 births, giving a general fertility rate of 61.6 births per 1000 women aged 15-44, the 32nd lowest rate out of all 72 Wisconsin counties. Of these, 77 of the births occurred at home, the fourth highest for Wisconsin counties. Additionally, there were 11 reported induced abortions performed on women of Green Lake County residence in 2017.
In 2010, the largest religious groups by number of adherents were Catholic at 5,290 adherents, Wisconsin Synod Lutheran at 2,498 adherents, Missouri Synod Lutheran at 1,173 adherents, ELCA Lutheran at 964 adherents, and Amish at 812 adherents.