| List of confirmed tornadoes - Tuesday,April 20,2004 |
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| F# | Location | County | Time (UTC) | Path length | Damage |
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| Illinois |
| F0 | NW of Victoria | Knox | 2216 | unknown | Destroyed one farm building and damaged two other farm buildings. Trees and power lines were downed as well. |
| F1 | E of Wyoming to W of Whitefield | Stark,Marshall,Bureau | 2213 | unknown | In Stark County,the tornado blew out 5 windows at a house and damaged the roof of a barn. In Marshall County,a barn and a pole barn were destroyed,farm equipment was damaged,and a grain bin was blown into a field. In Bureau County,the tornado struck a farmstead before dissipating,damaging the roof of the farmhouse along with several barns and outbuildings. |
| F3 | Granville/Utica areas | Putnam,LaSalle | 2273 | 15.8 miles | 8 deaths - See section on this tornado |
| F2 | N of Utica to Ottawa | LaSalle | 2316 | 9 miles | Multiple-vortex tornado touched down just outside Utica after the main F3 dissipated. East of town,it caused damage to 2 homes,trees,and outbuildings. Part of the roof of a house was torn off. A garage and grain bin were destroyed,and another garage lost its roof. The tornado then crossed I-80,damaging a building and flipping a semi-tractor trailer. The tornado then destroyed a machine shed and downed several power poles and trees. Two houses in this area were damaged before the tornado dissipated,with one sustaining roof damage,and the other losing most of its second story. |
| F0 | E of Utica | LaSalle | 2316 | 2.5 miles | Satellite tornado to the second Utica tornado. Caused no damage. |
| F1 | W of Wedron | LaSalle | 2355 | unknown | Tornado overturned a shed and a camping trailer,and snapped several trees. A detached garage was completely destroyed. |
| F0 | S of Sheridan | LaSalle | 2383 | 2 miles | Minor tree damage occurred. |
| F0 | SW of Minooka | Grundy | 0016 | unknown | Tornado struck an industrial complex. A wastewater treatment building was destroyed,with walls blown out and structural beams bent. There was damage to overhead doors,and an air handling unit was torn from a roof of another building. Further east,there was damage to walls and roof of an outbuilding. Antennas was blown down at the fire station on Route 6. |
| F1 | Joliet | Will | 0075 | 1.6 miles | Tornado affected mainly residential areas. Extensive tree damage occurred,and structures sustained minor damage. Roofs were blown off of a few homes and garages were destroyed as well. |
| F1 | S of Kankakee | Kankakee | 0056 | unknown | A house had its roof torn off,and numerous trees were snapped and uprooted. An empty corrugated grain bin was pushed into a tree. The tornado continued northeast to the Cognis chemical plant where the brick wall of a building fell outward. About 200 feet of chain link fence was torn up. Several cinder block buildings were damaged or destroyed in this complex just northeast of where the fence was taken out. A nearby bus garage sustained roof damage. A barn and several sheds were destroyed as well. |
| F0 | N of Piper City (1st tornado) | Ford | 2386 | unknown | A grain bin and an outbuilding were damaged. |
| F0 | N of Piper City (2nd tornado) | Ford | 2386 | unknown | Remained over open country with no damage. |
| F0 | W of Ashkum | Iroquois | 2398 | 5 miles | Remained over open country with no damage. |
| F2 | NW of Hopkins Park | Kankakee | 0030 | 3 miles | Several homes were damaged,a mobile home was destroyed,and large trees were knocked down or damaged. A church lost its roof and some walls. Two irrigation systems were overturned as well. |
| F0 | Grant Park | Kankakee | 0105 | 3 miles | A few homes in town sustained minor roof damage. Part of the roof of the fire station was peeled off,and a fence was damaged. Trees were downed,and a farm building sustained minor damage as well. |
| F0 | SE of Beecher | Will | 0130 | 1.5 miles | Tornado pulled shingles off of two mobile homes,and damaged the roof of a barn. |
| F1 | NW of Tuscola to SW of Pesotum | Douglas,Champaign | 1900 | unknown | Tornado damaged the front porch of a home,destroyed the garage,damaged a couple of sheds,and blew down several large trees. When the garage collapsed,it damaged a 1975 Corvette,as well as another car and two antique tractors. A nearby abandoned house was damaged as well. Tornado crossed into Champaign County,where it destroyed a barn,as well as several trees and power lines before dissipating. |
| F0 | NW of Sidney | Champaign | 1953 | unknown | Brief touchdown over open fields. |
| Iowa |
| F1 | NW of Welton | Clinton | 0013 | 1.3 miles | A machine shed was destroyed,as well as a 100-year-old barn and a hog building. A farmhouse sustained minor shingle and siding damage,and a nearby water tower had its wooden roof torn off. |
| Indiana |
| F1 | Jamestown | Boone | 2266 | 2 miles | Caused significant damage to a dozen homes in town. 2 homes had their roofs blown completely off and tossed several hundred feet into a corn field. There were 8 minor injuries,including one man whose semi was blown over along Interstate 74. |
| F0 | SW of Lebanon | Boone | 2275 | unknown | Scattered minor damage occurred. |
| F1 | E of Frankfort | Clinton | 2225 | 3.8 miles | Tornado destroyed 2 garages and a high school scoreboard,and also damaged a barn. |
| F0 | SE of Russiaville | Howard | 2275 | unknown | A barn was destroyed and a grain bin was overturned. |
| F1 | Kokomo | Howard | 2300 | .7 miles | Tornado severely damaged a skating rink and trucking company. There was also damage to 3 other homes. 1 minor injury was reported. |
| F0 | W of Amboy | Miami | 2340 | 1 miles | Tornado left swirl marks in a field. No actual damage occurred. |
| F1 | SW of Lincolnville | Wabash | 0013 | 2 miles | Two homes were heavily damaged and a barn was destroyed. |
| F0 | N of Harlansburg | Huntington | 0041 | 3.5 miles | There was minor damage to 5 homes and some trees. |
| F0 | E of Huntington | Huntington | 0066 | 6 miles | Minor tree damage occurred. |
| F0 | Point Isabel area | Grant | 0051 | unknown | Brief touchdown in a field with damage. |
| F0 | N of Elwood | Madison | 0040 | unknown | A barn was destroyed. |
| F0 | E of Fairmount | Grant | 0043 | 4 miles | Trees were damaged and power poles were snapped. |
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| Sources:Severe Weather Outbreak of April 20,2004,Tornado History Project Tornado Map - April 20,2004,The April 20,2004 Deadly Tornado Outbreak in Illinois and Indiana |
