Holiday Lake is a census-designated place located in Brooklyn Township in Poweshiek County in the state of Iowa, United States. As of the 2020 census the population was 473.

Holiday Lake is located 8 miles (13 km) north of the city of Brooklyn. The community surrounds a lake of the same name.

Historical population

Census	Pop.	Note	%±
2010	433		—
2020	473		9.2%
U.S. Decennial Census

As of the census of 2020, there were 473 people, 233 households, and 150 families residing in the community. The population density was 176.8 inhabitants per square mile (68.3/km). There were 563 housing units at an average density of 210.4 per square mile (81.2/km). The racial makeup of the community was 95.6% White, 0.2% Black or African American, 0.8% Native American, 0.0% Asian, 0.0% Pacific Islander, 0.4% from other races and 3.0% from two or more races. Hispanic or Latino persons of any race comprised 1.5% of the population.

Of the 233 households, 15.9% of which had children under the age of 18 living with them, 54.9% were married couples living together, 6.0% were cohabitating couples, 18.5% had a female householder with no spouse or partner present and 20.6% had a male householder with no spouse or partner present. 35.6% of all households were non-families. 29.6% of all households were made up of individuals, 11.2% had someone living alone who was 65 years old or older.

The median age in the community was 55.9 years. 15.6% of the residents were under the age of 20; 2.5% were between the ages of 20 and 24; 19.0% were from 25 and 44; 34.5% were from 45 and 64; and 28.3% were 65 years of age or older. The gender makeup of the community was 50.3% male and 49.7% female.