Chestnut Township is one of twenty-one townships in Knox County, Illinois, United States. As of the 2010 census, its population was 253 and it contained 121 housing units.

According to the 2010 census, the township has a total area of 36.18 square miles (93.7 km), all land.

• London Mills (northeast quarter)

• Hermon at 40°45′25″N 90°19′11″W / 40.756983°N 90.319848°W / 40.756983; -90.319848

(This list is based on USGS data and may include former settlements.)

• Bridgeport at 40°44′36″N 90°14′13″W / 40.743372°N 90.237068°W / 40.743372; -90.237068
• Burnside at 40°46′10″N 90°16′24″W / 40.769483°N 90.273458°W / 40.769483; -90.273458

(These towns are listed as "historical" by the USGS.)

The township contains these four cemeteries: Elias Bragg, Harper, Hermon Christian and Hermon Methodist.

• Davies Landing Strip

Historical population

Census	Pop.	Note	%±
2016 (est.)	246
U.S. Decennial Census

• Abingdon Community Unit School District 217
• Knoxville Community Unit School District 202
• Spoon River Valley Community Unit School District 4

• Illinois's 17th congressional district
• State House District 74
• State Senate District 37

• "Chestnut Township, Knox County, Illinois". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved February 20, 2010.
• United States Census Bureau 2009 TIGER/Line Shapefiles
• United States National Atlas

• City-Data.com
• Illinois State Archives
• Township Officials of Illinois