| Official Name: | Martinsville Township |
| Settlement Type: | Township |
| Image Map1: | Map of Illinois highlighting Clark County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Clark County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Clark |
| Established Title: | Established |
| Established Date: | November 7, 1854 |
| Area Total Sq Mi: | 41.82 |
| Area Land Sq Mi: | 41.67 |
| Area Water Sq Mi: | 0.15 |
| Area Water Percent: | 0.36 |
| Population As Of: | 2020 |
| Population Total: | 1542 |
| Population Density Sq Mi: | auto |
| Elevation M: | 196 |
| Elevation Ft: | 643 |
| Coordinates: | 39.3225°N -87.8561°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP code |
| Postal Code: | 62442 |
| Blank Name: | FIPS code |
| Blank Info: | 17-023-47267 |
| Unit Pref: | Imperial |
Martinsville Township is one of fifteen townships in Clark County, Illinois, USA. As of the 2020 census, its population was 1,542 and it contained 727 housing units.[1]
According to the 2010 census, the township has a total area of, of which (or 99.64%) is land and (or 0.36%) is water.[2]
(This list is based on USGS data and may include former settlements.)
The township contains these six cemeteries: Island Grove, Kettering, Lincoln, Mount Pleasant, Baird and Rupp.
As of the 2020 census there were 1,542 people, 716 households, and 521 families residing in the township. The population density was 36.91PD/sqmi. There were 727 housing units at an average density of 17.4/sqmi. The racial makeup of the township was 95.27% White, 0.06% African American, 0.13% Native American, 0.06% Asian, 0.00% Pacific Islander, 0.91% from other races, and 3.57% from two or more races. Hispanic or Latino of any race were 1.95% of the population.
There were 716 households, out of which 34.40% had children under the age of 18 living with them, 45.67% were married couples living together, 15.22% had a female householder with no spouse present, and 27.23% were non-families. 25.40% of all households were made up of individuals, and 16.50% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 2.61.
The township's age distribution consisted of 26.4% under the age of 18, 5.7% from 18 to 24, 25.8% from 25 to 44, 21.8% from 45 to 64, and 20.3% who were 65 years of age or older. The median age was 41.2 years. For every 100 females, there were 87.9 males. For every 100 females age 18 and over, there were 87.2 males.
The median income for a household in the township was $46,694, and the median income for a family was $61,875. Males had a median income of $40,250 versus $15,644 for females. The per capita income for the township was $22,657. About 16.3% of families and 20.7% of the population were below the poverty line, including 26.4% of those under age 18 and 5.0% of those age 65 or over.