| Official Name: | Cornwall Township |
| Settlement Type: | Township |
| Image Map1: | Map of Illinois highlighting Henry County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Henry County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Henry |
| Established Title: | Established |
| Established Date: | November 4, 1856 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 35.68 |
| Area Land Sq Mi: | 35.59 |
| Area Water Sq Mi: | 0.09 |
| Area Water Percent: | 0.26 |
| Population As Of: | 2020 |
| Population Total: | 222 |
| Population Density Sq Mi: | auto |
| Elevation M: | 201 |
| Elevation Ft: | 659 |
| Coordinates: | 41.3664°N -90.0297°W |
| Timezone: | CST |
| Utc Offset: | −6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | −5 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 61234, 61235, 61238, 61254, 61443 |
| Blank Name: | FIPS code |
| Blank Info: | 17-073-16444 |
Cornwall Township is one of twenty-four townships in Henry County, Illinois, US. At the 2020 census, its population was 222 and it contained 110 housing units.[1]
According to the 2021 census gazetteer files, Cornwall Township has a total area of 35.68sqmi, of which 35.59sqmi (or 99.74%) is land and 0.09sqmi (or 0.26%) is water.[2]
The township contains these three cemeteries: Grand View, Liberty and Saint Anthony.
As of the 2020 census there were 222 people, 100 households, and 91 families residing in the township. The population density was 6.22PD/sqmi. There were 110 housing units at an average density of 3.08/sqmi. The racial makeup of the township was 95.95% White, 0.00% African American, 0.00% Native American, 0.90% Asian, 0.00% Pacific Islander, 0.90% from other races, and 2.25% from two or more races. Hispanic or Latino of any race were 1.35% of the population.
There were 100 households, out of which 60.00% had children under the age of 18 living with them, 91.00% were married couples living together, none had a female householder with no spouse present, and 9.00% were non-families. 9.00% of all households were made up of individuals, and 4.00% had someone living alone who was 65 years of age or older. The average household size was 3.04 and the average family size was 3.24.
The township's age distribution consisted of 34.2% under the age of 18, 0.0% from 18 to 24, 34.5% from 25 to 44, 15.8% from 45 to 64, and 15.5% who were 65 years of age or older. The median age was 41.6 years. For every 100 females, there were 88.8 males. For every 100 females age 18 and over, there were 100.0 males.
The median income for a household in the township was $132,000, and the median income for a family was $132,986. Males had a median income of $100,875 versus $32,361 for females. The per capita income for the township was $44,573. None of the population was below the poverty line.