Manitou Beach and Devils Lake are two unincorporated communities in the Irish Hills region of Lenawee County in the U.S. state of Michigan. In order to provide statistical information, the United States Census Bureau has defined Manitou Beach-Devils Lake as a census-designated place (CDP) that includes both communities. The statistical information pertains to the entire CDP, although local understanding of the area making up these communities may vary somewhat from the definition of the CDP. The population of the CDP was 2,080 at the 2000 census.
According to the United States Census Bureau, the CDP has a total area of 9.7 square miles (25.2 km²), of which, 7.0 square miles (18.1 km²) of it is land and 2.7 square miles (7.1 km²) of it (28.13%) is water.
As of the census of 2000, there were 2,080 people, 898 households, and 600 families residing in the CDP. The population density was 297.3 per square mile (114.7/km²). There were 1,732 housing units at an average density of 247.5 per square mile (95.5/km²). The racial makeup of the CDP was 98.08% White, 0.19% African American, 0.14% Native American, 0.14% Asian, 0.19% from other races, and 1.25% from two or more races. Hispanic or Latino of any race were 1.25% of the population.
There were 898 households out of which 25.1% had children under the age of 18 living with them, 56.7% were married couples living together, 6.1% had a female householder with no husband present, and 33.1% were non-families. 28.2% of all households were made up of individuals and 10.4% had someone living alone who was 65 years of age or older. The average household size was 2.32 and the average family size was 2.81.
In the CDP, the population was spread out with 22.0% under the age of 18, 5.9% from 18 to 24, 27.5% from 25 to 44, 30.5% from 45 to 64, and 14.1% who were 65 years of age or older. The median age was 42 years. For every 100 females, there were 102.1 males. For every 100 females age 18 and over, there were 99.0 males.
The median income for a household in the CDP was $37,938, and the median income for a family was $63,810. Males had a median income of $39,375 versus $29,167 for females. The per capita income for the CDP was $24,561. About 4.3% of families and 6.8% of the population were below the poverty line, including 2.6% of those under age 18 and 12.9% of those age 65 or over.