Unimproved preserves
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Alessio Prairie
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Birds Junction Marsh
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Black Walnut Creek Preserve
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Briscoe Mounds
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Caton Farm Preserve
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Deer Creek Preserve
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Donohue Grove Preserve
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DuPage River Confluence Preserve
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Fiddyment Creek Preserve
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Hastert-Bechstein Preserve
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Hunters Woods
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Huyck's Grove Preserve
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Jackson Creek Preserve
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John Wesley Preserve
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Kraske Preserve
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Lake of the Woods Preserve
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Lily Cache Wetlands
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Lockport Loop Trail
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Lockport Prairie East Preserve
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Moeller Woods Preserve
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Plum Valley Ravines
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Potawatomi Woods Preserve
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Prairie Creek Preserve
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Romeoville Prairie Nature Preserve
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Sand Ridge Savanna Nature Preserve
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Tempest Farm
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Thorn Creek Headwaters Preserve
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Thorn Grove Preserve
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Vincennes Trail
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Walnut Hollow
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Wayne Lehnert Preserve