Merrimac is a village in Sauk County, Wisconsin, United States, northwest of Madison.

[10] As of the census[4] of 2010, there were 420 people, 185 households, and 123 families living in the village.

There were 257 housing units at an average density of 302.4 per square mile (116.8/km2).

23.8% of all households were made up of individuals, and 10.2% had someone living alone who was 65 years of age or older.

As of the census[6] of 2000, there were 416 people, 166 households, and 120 families living in the village.

There were 218 housing units at an average density of 287.1 per square mile (110.8/km2).

24.7% of all households were made up of individuals, and 9.6% had someone living alone who was 65 years of age or older.