| Official Name: | Marion Township, Michigan |
| Settlement Type: | Township |
| Pushpin Map: | Michigan#USA |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location within the state of Michigan |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Michigan |
| Subdivision Type2: | County |
| Subdivision Name2: | Sanilac |
| Unit Pref: | Imperial |
| Area Total Km2: | 93.6 |
| Area Land Km2: | 93.6 |
| Area Water Km2: | 0.0 |
| Area Total Sq Mi: | 36.1 |
| Area Land Sq Mi: | 36.1 |
| Area Water Sq Mi: | 0.0 |
| Population As Of: | 2020 |
| Population Total: | 1578 |
| Population Density Km2: | 16.9 |
| Population Density Sq Mi: | 43.7 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation M: | 239 |
| Elevation Ft: | 784 |
| Coordinates: | 43.5544°N -82.7061°W |
| Blank Name: | FIPS code |
| Blank Info: | 26-51720[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1626692 |
Marion Township is a civil township of Sanilac County in the U.S. state of Michigan. The population was 1,578 at the 2020 census.
According to the United States Census Bureau, the township has a total area of 36.1sqmi, all land.
As of the census of 2020, there were 1,578 people and 658 households in the township. The population density was 49.9sp=usNaNsp=us. There were 750 housing units at an average density of 20.8sp=usNaNsp=us. The racial makeup of the township was 95.34% White, 0.17% African American, 0.33% Native American, 0.50% Asian, 2.50% from other races, and 1.16% from two or more races. Hispanic or Latino of any race were 5.66% of the population.
There were 684 households, out of which 30.6% had children under the age of 18 living with them, 56.0% were married couples living together, 9.9% had a female householder with no husband present, and 31.6% were non-families. 26.9% of all households were made up of individuals, and 12.0% had someone living alone who was 65 years of age or older. The average household size was 2.51 and the average family size was 3.03.
In the township the population was spread out, with 25.1% under the age of 18, 8.4% from 18 to 24, 25.4% from 25 to 44, 23.2% from 45 to 64, and 17.9% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 90.2 males. For every 100 females age 18 and over, there were 87.6 males.
The median income for a household in the township was $34,803, and the median income for a family was $41,739. Males had a median income of $30,600 versus $21,014 for females. The per capita income for the township was $17,964. About 7.2% of families and 11.5% of the population were below the poverty line, including 16.9% of those under age 18 and 9.8% of those age 65 or over.