Mount Vernon Township is one of sixteen townships in Jefferson County, Illinois, USA. As of the 2010 census, its population was 13,374 and it contained 6,422 housing units.

Geography

According to the 2010 census, the township has a total area of 37.21 square miles (96.4 km), of which 36.95 square miles (95.7 km) (or 99.30%) is land and 0.26 square miles (0.67 km) (or 0.70%) is water. The township is centered at 38°21′N 88°52′W (38.349,-88.859). It is traversed north–south by State Route 37, east–west by State Route 15, and diagonally across its southwest corner by State Route 142.

Cities, towns, villages

• Mount Vernon

Unincorporated towns

• Camp Ground at 38°20′20″N 88°50′10″W / 38.339°N 88.836°W / 38.339; -88.836
• Idlewood at 38°22′48″N 88°55′20″W / 38.380°N 88.9223°W / 38.380; -88.9223
• Summersville at 38°19′41″N 88°52′01″W / 38.328°N 88.867°W / 38.328; -88.867

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

Adjacent townships

• Field Township (north)
• Farrington Township (northeast)
• Webber Township (east)
• Pendleton Township (southeast)
• Dodds Township (south)
• Shiloh Township (west)
• Rome Township (northwest)

Cemeteries

The township contains these nine cemeteries: Atkinson, East Salem, Etheridge Farm, Hopewell, Oakwood, Old Union, Saint Mary's, Sursa and Williams.

Major highways

• Illinois Route 15
• Illinois Route 37
• Illinois Route 142

Airports and landing strips

• Good Samaritan Regional Health Care Center Heliport
• Mount Vernon/Outland Airport

Demographics

Historical population

Census	Pop.	Note	%±
2016 (est.)	13,216
U.S. Decennial Census

Political districts

• Illinois's 19th congressional district
• State House District 107
• State Senate District 54