| Official Name: | Southwest Township |
| Settlement Type: | Township |
| Image Map1: | Map of Illinois highlighting Crawford County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Crawford County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Crawford |
| Established Title: | Established |
| Established Date: | June 21, 1869 |
| Area Total Sq Mi: | 15.05 |
| Area Land Sq Mi: | 15.05 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0 |
| Population As Of: | 2020 |
| Population Total: | 96 |
| Population Density Sq Mi: | auto |
| Elevation M: | 146 |
| Elevation Ft: | 479 |
| Coordinates: | 38.8647°N -87.8706°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 62421, 62466 |
| Blank Name: | FIPS code |
| Blank Info: | 17-033-71344 |
| Unit Pref: | Imperial |
Southwest Township is one of ten townships in Crawford County, Illinois, USA. As of the 2020 census, its population was 96 and it contained 38 housing units.[1]
According to the 2010 census, the township has a total area of, all land.[2]
The township contains these two cemeteries: Keplinger and Waggoner.
As of the 2020 census there were 96 people, 18 households, and 18 families residing in the township. The population density was 6.38PD/sqmi. There were 38 housing units at an average density of 2.52/sqmi. The racial makeup of the township was 87.50% White, 0.00% African American, 0.00% Native American, 2.08% Asian, 0.00% Pacific Islander, 0.00% from other races, and 10.42% from two or more races. Hispanic or Latino of any race were 1.04% of the population.
There were 18 households, out of which none had children under the age of 18 living with them, 100.00% were married couples living together, none had a female householder with no spouse present, and none were non-families. No households were made up of individuals.
The township's age distribution consisted of 0.0% under the age of 18, 0.0% from 18 to 24, 0.0% from 25 to 44, 58.8% from 45 to 64, and 41.2% who were 65 years of age or older. The median age was 57.6 years. For every 100 females, there were 88.9 males. For every 100 females age 18 and over, there were 88.9 males.