| Official Name: | South Arm Township, Michigan |
| Settlement Type: | Civil township |
| Pushpin Map: | Michigan |
| Pushpin Label: | South Arm Township |
| Pushpin Label Position: | left |
| 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: | Charlevoix |
| Government Footnotes: | [1] |
| Leader Title: | Supervisor |
| Leader Name: | Robert Christensen |
| Leader Title1: | Clerk |
| Leader Name1: | Kimberly Olstrom |
| Unit Pref: | Imperial |
| Area Total Km2: | 84.64 |
| Area Land Km2: | 79.36 |
| Area Water Km2: | 5.28 |
| Area Total Sq Mi: | 32.68 |
| Area Land Sq Mi: | 30.64 |
| Area Water Sq Mi: | 2.04 |
| Population As Of: | 2020 |
| Population Total: | 1939 |
| Population Density Sq Mi: | auto |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation M: | 230 |
| Elevation Ft: | 755 |
| Coordinates: | 45.1667°N -85.155°W |
| Postal Code Type: | ZIP code(s) |
| Postal Code: | 49727 (East Jordan) 49729 (Ellsworth) |
| Area Code: | 231 |
| Blank Name: | FIPS code |
| Blank Info: | 26-74680[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1627092 |
South Arm Township is a civil township of Charlevoix County in the U.S. state of Michigan. The population was 1,939 at the 2020 census.[3]
According to the U.S. Census Bureau, the township has a total area of 32.68sqmi, of which 30.64sqmi is land and 2.04sqmi (6.24) is water.[4]
The township contains a coastline along the southern arm of Lake Charlevoix.
As of the census of 2000, there were 1,844 people, 670 households, and 517 families residing in the township. The population density was 60sp=usNaNsp=us. There were 947 housing units at an average density of 30.8sp=usNaNsp=us. The racial makeup of the township was 96.10% White, 1.68% Native American, 0.11% Asian, 1.25% from other races, and 0.87% from two or more races. Hispanic or Latino of any race were 1.63% of the population.
There were 670 households, out of which 33.6% had children under the age of 18 living with them, 69.0% were married couples living together, 4.6% had a female householder with no husband present, and 22.7% were non-families. 18.7% of all households were made up of individuals, and 8.5% had someone living alone who was 65 years of age or older. The average household size was 2.60 and the average family size was 2.96.
In the township the population was spread out, with 25.1% under the age of 18, 5.3% from 18 to 24, 26.5% from 25 to 44, 26.5% from 45 to 64, and 16.7% who were 65 years of age or older. The median age was 41 years. For every 100 females, there were 97.4 males. For every 100 females age 18 and over, there were 93.8 males.
The median income for a household in the township was $42,159, and the median income for a family was $48,438. Males had a median income of $31,964 versus $25,096 for females. The per capita income for the township was $17,554. About 3.5% of families and 4.8% of the population were below the poverty line, including 4.3% of those under age 18 and 6.3% of those age 65 or over.
South Arm Township is served by two separate public school districts. The vast majority of the township is served by East Jordan Public Schools within the city of East Jordan. A small portion of the southwest corner of the township is served by Ellsworth Community School to the west in the village of Ellsworth in Antrim County.[5]