Crystal Lake is a town in Marquette County, Wisconsin, United States.

As of the census[2] of 2000, there were 513 people, 231 households, and 167 families residing in the town.

There were 442 housing units at an average density of 12.5 per square mile (4.8/km2).

There were 231 households, out of which 16.0% had children under the age of 18 living with them, 66.7% were married couples living together, 3.5% had a female householder with no husband present, and 27.3% were non-families.

20.8% of all households were made up of individuals, and 10.8% had someone living alone who was 65 years of age or older.