Mio /ˈmaɪ.oʊ/ is an unincorporated community in the U.S. state of Michigan. It is the county seat of Oscoda County and is situated along the boundary between Mentor Township on the east, Big Creek Township on the west, and Elmer Township to the northwest.
According to the United States Census Bureau, the CDP has a total area of 8.1 square miles (21 km) of which 7.5 square miles (19 km) is land and 0.6 square miles (1.6 km) (8.01%) is water.
As of the census of 2000, there were 2,016 people, 826 households, and 537 families residing in the CDP. The population density was 270.1 per square mile (104.3/km). There were 1,191 housing units at an average density of 159.6 per square mile (61.6/km). The racial makeup of the CDP was 96.83% White, 0.15% African American, 0.55% Native American, 0.10% Asian, 0.25% from other races, and 2.13% from two or more races. Hispanic or Latino of any race were 1.44% of the population.
Many Mio residents are either Amish, of Amish descent, Mennonite, or of Mennonite descent – with most being non-Anabaptist Christians.
There were 826 households out of which 30.3% had children under the age of 18 living with them, 49.4% were married couples living together, 11.5% had a female householder with no husband present, and 34.9% were non-families. 28.5% of all households were made up of individuals and 13.4% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 2.99.
In the CDP, the population was spread out with 26.0% under the age of 18, 8.2% from 18 to 24, 27.8% from 25 to 44, 21.9% from 45 to 64, and 16.1% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 92.6 males. For every 100 females age 18 and over, there were 87.5 males.
The median income for a household in the CDP was $26,831, and the median income for a family was $31,379. Males had a median income of $29,542 versus $20,927 for females. The per capita income for the community was $13,064. About 13.9% of families and 21.3% of the population were below the poverty line, including 33.3% of those under age 18 and 13.4% of those age 65 or over.