Demographics
As of the 2020 census [1] there were 837 people, 246 households, and 165 families residing in the township. The population density was 22.47 inhabitants per square mile (8.68/km2). There were 336 housing units at an average density of 9.02 per square mile (3.48/km2). The racial makeup of the township was 90.44% White, 0.00% African American, 0.00% Native American, 0.12% Asian, 0.00% Pacific Islander, 2.87% from other races, and 6.57% from two or more races. Hispanic or Latino of any race were 8.24% of the population.
There were 246 households, out of which 12.60% had children under the age of 18 living with them, 61.79% were married couples living together, 2.44% had a female householder with no spouse present, and 32.93% were non-families. 23.60% of all households were made up of individuals, and 14.20% had someone living alone who was 65 years of age or older. The average household size was 2.37 and the average family size was 2.88.
The township's age distribution consisted of 10.7% under the age of 18, 11.0% from 18 to 24, 24.1% from 25 to 44, 37.3% from 45 to 64, and 17.0% who were 65 years of age or older. The median age was 47.3 years. For every 100 females, there were 111.6 males. For every 100 females age 18 and over, there were 108.8 males.
The median income for a household in the township was $72,188, and the median income for a family was $95,469. Males had a median income of $49,881 versus $32,917 for females. The per capita income for the township was $32,741. About 4.8% of families and 8.9% of the population were below the poverty line, including 0.0% of those under age 18 and 23.2% of those age 65 or over.
Historical population| Census | Pop. | Note | %± |
|---|
| 2000 | 890 | | — |
|---|
| 2010 | 910 | | 2.2% |
|---|
| 2020 | 837 | | −8.0% |
|---|
|
Water bodies
Many creeks run at a southwest direction toward the township. They provide drainage for the townships farmland and residences. Three of these creeks begin the Will Township, Sumner Township's neighbor to the north in Will County. These include the Marshall Slough, Rock Creek, and the Exline Slough. The Marshall Slough cuts through Sumner Township in the far northwest corner and quickly cuts into Manteno Township. Rock Creek also cuts quickly through the township before it cuts into Manteno Township a mile south of Sumner Township's northern border. The Exline Slough is the biggest creek in Sumner Township and runs all the way from County Line Road at the north edge of the township to 6000 N. Rd. In Section 30 the Canavan Slough, which starts a mile north of the town of Whitaker, joins up with the Exline Slough. Farr Creek begins a half mile south of the southern border of Sumner Township, in Section 32, before crossing the southern border. Tower Creek starts in the northeast quarter of the township and runs into Ganeer Township which is south of Sumner Township.
Government
The township is governed by an elected Town Board of a supervisor and four trustees. The township also has an elected assessor, clerk, highway commissioner and supervisor. The township office is located at 9315 North 8000 East Road, Grant Park, IL 60940.
Cemeteries
The township contains these three cemeteries: Heusing, Zion Lutheran (Sollitt) and Saint Paul Lutheran (Petersburg).
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