More Info. The white oak is the state tree of five states, including Illinois. It is the most common oak in DuPage County and is the dominant tree in most of the county’s upland forests and woodlands.Click to see full answer. Likewise, people ask, what types of trees are in Illinois?trees like American beech, American elm, sycamore, tuliptree, sugar maple, red oak, sweetgum, pawpaw, buckeyes, holly and spicebush, may be found in this collage of habitats. White Oak is one of twenty oak tree species native to Illinois. how many trees are in Illinois? More than 250 species of trees (native and introduced) have been found growing in Illinois. More than 75 percent of the wildlife habitat in Illinois is in the forests. More than 420 verte- brate species use forest habitats. Also Know, what is the most common tree in Chicago? Maple Trees are one of the most common and recognizable trees in the Chicago area.What is the best tree to plant in Illinois? If a tree needs a certain type of soil, for example, it will not thrive in an area without that type. Corneliancherry dogwood. A good, all-purpose, non-native “understory” tree, meaning it will get 15-20 feet high. Japanese tree lilac. American hornbeam. Lace bark elm. Concolor fir, or white fir. Japanese zelkova.