| Official Name: | Arenac Township, Michigan |
| Settlement Type: | Civil township |
| Pushpin Map: | Michigan#USA |
| Pushpin Label Position: | left |
| Pushpin Label: | Arenac Township |
| Pushpin Map Caption: | Location within the state of Michigan |
| Mapsize: | 250 |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Michigan |
| Subdivision Type2: | County |
| Subdivision Name2: | Arenac |
| Leader Title: | Supervisor |
| Leader Name: | Tim Hagley |
| Unit Pref: | Imperial |
| Area Total Km2: | 98.6 |
| Area Land Km2: | 92.7 |
| Area Water Km2: | 5.9 |
| Population As Of: | 2020 |
| Population Total: | 871 |
| Population Density Km2: | auto |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation M: | 187 |
| Elevation Ft: | 614 |
| Coordinates: | 44.0269°N -83.8572°W |
| Postal Code Type: | ZIP code(s) |
| Postal Code: | 48658, 49749, 48766 |
| Area Code: | 989 |
| Blank Name: | FIPS code |
| Blank Info: | 26-03360[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1625846 |
Arenac Township is a civil township of Arenac County in the U.S. state of Michigan. As of the 2020 census, the township population was 871.[2] The city of Omer is surrounded by the township but is administered autonomously.
According to the United States Census Bureau, the township has a total area of 98.6km2, of which 92.7km2 is land and 5.9km2, or 6.02%, is water.[3]
As of the census of 2000, there were 992 people, 389 households, and 275 families residing in the township. The population density was 27.1sp=usNaNsp=us. There were 495 housing units at an average density of 13.5sp=usNaNsp=us. The racial makeup of the township was 96.57% White, 0.40% African American, 1.31% Native American, 0.10% Asian, 0.10% from other races, and 1.51% from two or more races. Hispanic or Latino of any race were 0.71% of the population.
There were 389 households, out of which 29.0% had children under the age of 18 living with them, 56.8% were married couples living together, 8.5% had a female householder with no husband present, and 29.3% were non-families. 23.4% of all households were made up of individuals, and 12.3% had someone living alone who was 65 years of age or older. The average household size was 2.55 and the average family size was 3.01.
In the township the population was spread out, with 23.0% under the age of 18, 8.9% from 18 to 24, 26.9% from 25 to 44, 22.6% from 45 to 64, and 18.6% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 98.4 males. For every 100 females age 18 and over, there were 99.0 males.
The median income for a household in the township was $35,417, and the median income for a family was $39,000. Males had a median income of $30,000 versus $23,194 for females. The per capita income for the township was $16,673. About 9.8% of families and 12.4% of the population were below the poverty line, including 18.4% of those under age 18 and 9.0% of those age 65 or over.