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| 2015 Class 3A Sectional Assignments |  
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| Sectional A @ Sauk Valley Community College, Dixon
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| Host: Sterling Challand Date: Saturday, October 10, 2015
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| Belvidere Central Belvidere South
 Freeport Carl Sandburg   
 (Coop)
 Galesburg Churchill   
 (Coop)
 Geneseo MS
 Loves Park Harlem
 Rock Island Washington   
 (Coop)
 Rockford Eisenhower
 Rockford Flinn
 Rockford Lincoln
 Rockford RESA
 Rockford West
 Roscoe
 Sterling Challand
 
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| Sectional B @ Yorkville High School, Yorkville
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| Host: Yorkville Date: Saturday, October 10, 2015
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| Algonquin Heineman Aurora Bednarcik
 Batavia Rotolo
 Burlington Central
 Cary
 DeKalb Huntley
 Lake in the Hills Marlowe
 Minooka
 Morris Shabbona   
 (Coop)
 Oak Park Brooks
 Oswego Plank
 Oswego Traughber
 Sugar Grove Kaneland Harter
 Sycamore
 Yorkville
 
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| Sectional C @ McHenry Middle School, McHenry
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| Host: McHenry MS Date: Saturday, October 10, 2015
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| Antioch Barrington Prairie
 Barrington Station
 Beach Park
 Grayslake
 Gurnee Woodland
 Lake Villa Palombi
 Lake Zurich North
 Lake Zurich South
 McHenry MS
 McHenry Parkland
 Vernon Hills Hawthorn South
 Woodstock Creekside
 Woodstock Northwood
 
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| Sectional D @ Arlington Heights South Middle School, Arlington Heights
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| Host: Arlington Heights South Date: Saturday, October 10, 2015
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| Arlington Heights South Arlington Heights Thomas
 Buffalo Grove Aptakisic
 Buffalo Grove Cooper
 Des Plaines Friendship
 Evanston Haven
 Lake Forest Deer Path
 Lincolnshire Daniel Wright
 Long Grove Woodlawn
 Mt. Prospect Lincoln
 Mundelein Fremont
 Oswego Thompson
 Wheeling Holmes
 Wheeling London
 Wilmette JHS
 
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| IESA Cross-Country 2015 Class 3A Sectional Assignments |  | 
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| Sectional E @ Central Park, Bolingbrook
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| Host: Bolingbrook Jane Addams Date: Saturday, October 10, 2015
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| Bolingbrook Brooks Bolingbrook Humphrey
 Bolingbrook Jane Addams
 Flossmoor Parker
 Homer Glen Homer
 Homewood Hart
 Lansing Memorial
 Lemont Old Quarry
 Markham Prairie-Hills
 Matteson Colin Powell
 Oak Park Julian
 Romeoville Lukancic
 Romeoville Martinez
 Woodridge Jefferson
 
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| Sectional F @ Crossroads Elementary School, Shorewood
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| Host: Shorewood Troy Date: Saturday, October 10, 2015
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| Bourbonnais UGC Chicago Heights Washington
 Frankfort Hickory Creek
 Frankfort Summit Hill
 Joliet Dirksen
 Joliet Gompers
 Joliet Hufford
 Joliet Washington
 Lockport Oak Prairie
 Mokena
 New Lenox Liberty
 New Lenox Martino
 Shorewood Troy
 University Park Crete Monee
 
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| Sectional G @ Chatham South Park, Chatham
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| Host: Chatham Glenwood Date: Saturday, October 10, 2015
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| Alton Cahokia Wirth
 Chatham Glenwood
 Decatur Jefferson
 Edwardsville Liberty
 Edwardsville Lincoln
 Jacksonville Turner
 Morton JHS
 Mt. Zion
 Pekin Broadmoor   
 (Coop)
 Quincy
 Springfield Franklin
 Springfield Grant
 Springfield Washington   
 (Coop)
 
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| Sectional H @ Lake of the Woods, Mahomet
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| Host: Mahomet-Seymour Date: Saturday, October 10, 2015
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| Bloomington Evans Bloomington JHS
 Champaign Edison
 Champaign Franklin
 Champaign Jefferson
 Charleston
 Danville North Ridge
 Danville South View
 Mahomet-Seymour
 Mattoon
 Normal Chiddix
 Normal Kingsley
 Normal Parkside
 Urbana MS
 
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 Class HistoryThe IESA sanctioned Cross-Country in 1979. There was one class of Cross-Country until 1997 when the activity was split into A and AA based upon enrollment. It was split in 2012 into three classes of 1A, 2A and 3A. In 2023 it was split again into the current four classes of 1A, 2A, 3A and 4A. How Class Split is Determined |