| Official Name: | Rubicon Township |
| Settlement Type: | Township |
| Image Map1: | Map of Illinois highlighting Greene County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Greene County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Greene |
| Established Title: | Established |
| Established Date: | November 4, 1884 |
| Area Total Sq Mi: | 35.75 |
| Area Land Sq Mi: | 35.67 |
| Area Water Sq Mi: | 0.08 |
| Area Water Percent: | 0.23 |
| Population As Of: | 2020 |
| Population Total: | 272 |
| Population Density Sq Mi: | auto |
| Elevation M: | 185 |
| Elevation Ft: | 607 |
| Coordinates: | 39.3969°N -90.2075°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP code |
| Postal Code: | 62044 |
| Blank Name: | FIPS code |
| Blank Info: | 17-061-66235 |
| Unit Pref: | Imperial |
Rubicon Township is one of thirteen townships in Greene County, Illinois, USA. As of the 2020 census, its population was 272 and it contained 138 housing units.[1]
According to the 2021 census gazetteer files, Rubicon Township has a total area of 35.75sqmi, of which 35.67sqmi (or 99.77%) is land and 0.08sqmi (or 0.23%) is water.[2]
The township contains these eight cemeteries: Crawford, Drake-Million, Hermitage, Oakwood, Rose Hill West, Rubican, Short and Vandaveer.
As of the 2020 census there were 272 people, 166 households, and 111 families residing in the township. The population density was 7.61PD/sqmi. There were 138 housing units at an average density of 3.86/sqmi. The racial makeup of the township was 97.79% White, 0.37% African American, 0.00% Native American, 0.00% Asian, 0.00% Pacific Islander, 0.00% from other races, and 1.84% from two or more races. Hispanic or Latino of any race were 0.37% of the population.
There were 166 households, out of which 19.90% had children under the age of 18 living with them, 66.87% were married couples living together, 0.00% had a female householder with no spouse present, and 33.13% were non-families. 29.50% of all households were made up of individuals, and 13.90% 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 3.21.
The township's age distribution consisted of 16.8% under the age of 18, 3.8% from 18 to 24, 23.6% from 25 to 44, 29.9% from 45 to 64, and 26.0% who were 65 years of age or older. The median age was 47.8 years. For every 100 females, there were 111.2 males. For every 100 females age 18 and over, there were 104.7 males.
The median income for a household in the township was $67,083. Males had a median income of $56,563 versus $33,147 for females. The per capita income for the township was $35,149. About 24.3% of families and 28.4% of the population were below the poverty line, including 81.4% of those under age 18 and none of those age 65 or over.