Persifer Township is one of twenty-one townships in Knox County, Illinois, USA. As of the 2010 census, its population was 980 and it contained 835 housing units.

According to the 2010 census, the township has a total area of 35.57 square miles (92.1 km), of which 34.72 square miles (89.9 km) (or 97.61%) is land and 0.85 square miles (2.2 km) (or 2.39%) is water.

• Appleton at 40°56′09″N 90°09′39″W / 40.935871°N 90.160954°W / 40.935871; -90.160954
• Dahinda at 40°55′29″N 90°06′32″W / 40.92476°N 90.109007°W / 40.92476; -90.109007
• Oak Run at 40°57′48″N 90°08′42″W / 40.963371°N 90.14512°W / 40.963371; -90.14512
• Trenton Corners at 40°54′29″N 90°06′50″W / 40.908093°N 90.114007°W / 40.908093; -90.114007

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

The township contains these three cemeteries: Bradford, Myers and Trenton.

Historical population

Census	Pop.	Note	%±
2016 (est.)	954
U.S. Decennial Census

• Knoxville Community Unit School District 202
• Williamsfield Community Unit School District 210

• Illinois's 18th congressional district
• State House District 74
• State Senate District 37

• "Persifer Township, Knox County, Illinois". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved February 25, 2010.
• United States Census Bureau 2009 TIGER/Line Shapefiles
• United States National Atlas

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