Moving towards the start of the 2018-19 athletic year, an updated listing of high school conference membership. There are some big changes this year. If I have missed any, let me know.
Capitol Conference (8)
Arlington
Ashland-Greenwood
Douglas County West
Fort Calhoun
Platteview
Raymond Central
Syracuse
Wahoo
Centennial Conference (11)
Boys Town (boys only)
Columbus Scotus
David City Aquinas
Fremont Bergan
Grand Island Central Catholic
Hastings St. Cecilia
Kearney Catholic
Lincoln Christian
Lincoln Lutheran
Omaha Concordia
Wahoo Neumann
Central Conference (10)
Aurora
Columbus Lakeview
Crete
Grand Island Northwest
Hastings Adams Central
Holdrege
Lexington
Schuyler
Seward
York
Crossroads Conference (13)
Bruning-Davenport/Shickley
Cross County
Dorchester
East Butler
Exeter-Milligan
Giltner
Hampton
High Plains
McCool Junction
Meridian
Nebraska Lutheran
Osceola
Shelby/Rising City
East Central Nebraska Conference (11)
Auburn
Conestoga
Elmwood-Murdock
Freeman
Johnson County Central
Louisville
Malcolm
Mead
Palmyra
Weeping Water
Yutan
East Husker Conference (15)
Bancroft-Rosalie/Lyons-Decatur
Clarkson/Leigh
Howells-Dodge
Humphrey/Lindsay Holy Family
Logan View
Madison
North Bend
Oakland-Craig
Pender
Scribner-Snyder
Stanton
Tekamah-Herman
Twin River
West Point-Beemer
Wisner-Pilger
Eastern Midlands Conference (8)
Bennington
Blair
Elkhorn
Gretna
Nebraska City
Norris
Plattsmouth
Waverly
Fort Kearny Conference (10)
Amherst
Axtell
Elm Creek
Elwood
Eustis-Farnam
Loomis
Overton
Pleasanton
Sumner-Eddyville-Miller
Wilcox-Hildreth
Frontier Conference (7)
Boys Town (girls only)
Cedar Bluffs
College View Academy
Cornerstone Christian
Omaha Brownell-Talbot
Omaha Christian
Parkview Christian
Goldenrod Conference (10)
Burwell
Central Valley
Fullerton
Heartland Lutheran
Humphrey St. Francis
Nebraska Christian
Palmer
Riverside
Spalding Academy
St. Edward
Greater Nebraska Athletic Conference (6)
Columbus
Gering
Hastings
McCook
North Platte
Scottsbluff
Heartland Athletic Conference (11)
Fremont
Grand Island
Kearney
Lincoln East
Lincoln High
Lincoln North Star
Lincoln Northeast
Lincoln Pius X
Lincoln Southeast
Lincoln Southwest
Norfolk
Independents (5)
Falls City
Lutheran High Northeast
Omaha Mercy
Omaha Nation
Omaha Street School
Lewis & Clark Conference (17)
Allen
Bloomfield
Creighton
Emerson-Hubbard
Hartington-Newcastle
Homer
Laurel-Concord-Coleridge
Osmond
Plainview
Ponca
Randolph
Wakefield
Walthill
Wausa
Winnebago
Winside
Wynot
LouPlatte Conference (9)
Central City
Centura
Doniphan-Trumbull
Gibbon
Loup City
Ord
Ravenna
St. Paul
Wood River
Metro Conference (18)
Bellevue East
Bellevue West
Elkhorn South
Millard North
Millard South
Millard West
Omaha Benson
Omaha Bryan
Omaha Burke
Omaha Central
Omaha Creighton Prep
Omaha Marian
Omaha North
Omaha Northwest
Omaha South
Omaha Westside
Papillion-LaVista
Papillion-LaVista South
Mid-Nebraska Activities Conference (12)
Anselmo-Merna
Ansley/Litchfield
Arthur County
Brady
Cody-Kilgore
Hyannis
McPherson County
Mullen
Sandhills/Thedford
South Loup
Stapleton
Twin Loup
Mid-State Conference (9)
Battle Creek
Boone Central/Newman Grove
Crofton
Guardian Angels Central Catholic
Hartington Cedar Catholic
Norfolk Catholic
O'Neill
Pierce
Wayne
Minuteman Activities Conference (8)
Banner County
Bayard
Creek Valley
Garden County
Leyton
Minatare
Potter-Dix
South Platte
MUDECAS (8)
Diller-Odell
Falls City Sacred Heart
Freeman
Lewiston
Nebraska City Lourdes
Parkview Christian
Pawnee City
Sterling
Niobrara Valley Conference (13)
Atkinson West Holt
Boyd County
Chambers/Wheeler Central
Clearwater/Orchard
Elgin/Elgin Pope John
Elkhorn Valley
Ewing
Neligh-Oakdale
Niobrara/Verdigre
North Central
O'Neill St. Mary's
Santee
Stuart
Panhandle Conference (5)
Crawford
Edgemont (South Dakota)
Hay Springs
Hemingford
Sioux County
Pioneer Conference (10)
Diller-Odell
Falls City Sacred Heart
Friend
Humboldt-Table Rock-Steinauer
Johnson-Brock
Lewiston
Nebraska City Lourdes
Pawnee City
Southern
Sterling
Republican Plains Activities Conference (15)
Alma
Arapahoe
Bertrand
Cambridge
Dundy County-Stratton
Hayes Center
Hitchcock County
Maxwell
Maywood
Medicine Valley
Paxton
Southern Valley
Southwest
Wallace
Wauneta-Palisade
River Cities Conference (8)
Beatrice
Elkhorn Mt. Michael
Omaha Duchesne
Omaha Gross
Omaha Roncalli
Omaha Skutt
Ralston
South Sioux City
South Platte Valley Association (7)
Bridgeport
Chase County
Hershey
Kimball
North Platte St. Patrick's
Perkins County
Sutherland
Southern Nebraska Conference (12)
Centennial
David City
Fairbury
Fillmore Central
Heartland
Milford
Sandy Creek
Superior
Sutton
Thayer Central
Tri County
Wilber-Clatonia
Southwest Conference (8)
Ainsworth
Broken Bow
Cozad
Gothenburg
McCook
Minden
Ogallala
Valentine
Twin Valley Conference (9)
Blue Hill
Deshler
Franklin
Harvard
Kenesaw
Lawrence-Nelson
Red Cloud
Shelton
Silver Lake
Western Conference (6)
Alliance
Chadron
Gering
Mitchell
Scottsbluff
Sidney
Western Trails Conference (7)
Bayard
Bridgeport
Gordon-Rushville
Hemingford
Kimball
Mitchell
Morrill
Capitol Conference (8)
Arlington
Ashland-Greenwood
Douglas County West
Fort Calhoun
Platteview
Raymond Central
Syracuse
Wahoo
Centennial Conference (11)
Boys Town (boys only)
Columbus Scotus
David City Aquinas
Fremont Bergan
Grand Island Central Catholic
Hastings St. Cecilia
Kearney Catholic
Lincoln Christian
Lincoln Lutheran
Omaha Concordia
Wahoo Neumann
Central Conference (10)
Aurora
Columbus Lakeview
Crete
Grand Island Northwest
Hastings Adams Central
Holdrege
Lexington
Schuyler
Seward
York
Crossroads Conference (13)
Bruning-Davenport/Shickley
Cross County
Dorchester
East Butler
Exeter-Milligan
Giltner
Hampton
High Plains
McCool Junction
Meridian
Nebraska Lutheran
Osceola
Shelby/Rising City
East Central Nebraska Conference (11)
Auburn
Conestoga
Elmwood-Murdock
Freeman
Johnson County Central
Louisville
Malcolm
Mead
Palmyra
Weeping Water
Yutan
East Husker Conference (15)
Bancroft-Rosalie/Lyons-Decatur
Clarkson/Leigh
Howells-Dodge
Humphrey/Lindsay Holy Family
Logan View
Madison
North Bend
Oakland-Craig
Pender
Scribner-Snyder
Stanton
Tekamah-Herman
Twin River
West Point-Beemer
Wisner-Pilger
Eastern Midlands Conference (8)
Bennington
Blair
Elkhorn
Gretna
Nebraska City
Norris
Plattsmouth
Waverly
Fort Kearny Conference (10)
Amherst
Axtell
Elm Creek
Elwood
Eustis-Farnam
Loomis
Overton
Pleasanton
Sumner-Eddyville-Miller
Wilcox-Hildreth
Frontier Conference (7)
Boys Town (girls only)
Cedar Bluffs
College View Academy
Cornerstone Christian
Omaha Brownell-Talbot
Omaha Christian
Parkview Christian
Goldenrod Conference (10)
Burwell
Central Valley
Fullerton
Heartland Lutheran
Humphrey St. Francis
Nebraska Christian
Palmer
Riverside
Spalding Academy
St. Edward
Greater Nebraska Athletic Conference (6)
Columbus
Gering
Hastings
McCook
North Platte
Scottsbluff
Heartland Athletic Conference (11)
Fremont
Grand Island
Kearney
Lincoln East
Lincoln High
Lincoln North Star
Lincoln Northeast
Lincoln Pius X
Lincoln Southeast
Lincoln Southwest
Norfolk
Independents (5)
Falls City
Lutheran High Northeast
Omaha Mercy
Omaha Nation
Omaha Street School
Lewis & Clark Conference (17)
Allen
Bloomfield
Creighton
Emerson-Hubbard
Hartington-Newcastle
Homer
Laurel-Concord-Coleridge
Osmond
Plainview
Ponca
Randolph
Wakefield
Walthill
Wausa
Winnebago
Winside
Wynot
LouPlatte Conference (9)
Central City
Centura
Doniphan-Trumbull
Gibbon
Loup City
Ord
Ravenna
St. Paul
Wood River
Metro Conference (18)
Bellevue East
Bellevue West
Elkhorn South
Millard North
Millard South
Millard West
Omaha Benson
Omaha Bryan
Omaha Burke
Omaha Central
Omaha Creighton Prep
Omaha Marian
Omaha North
Omaha Northwest
Omaha South
Omaha Westside
Papillion-LaVista
Papillion-LaVista South
Mid-Nebraska Activities Conference (12)
Anselmo-Merna
Ansley/Litchfield
Arthur County
Brady
Cody-Kilgore
Hyannis
McPherson County
Mullen
Sandhills/Thedford
South Loup
Stapleton
Twin Loup
Mid-State Conference (9)
Battle Creek
Boone Central/Newman Grove
Crofton
Guardian Angels Central Catholic
Hartington Cedar Catholic
Norfolk Catholic
O'Neill
Pierce
Wayne
Minuteman Activities Conference (8)
Banner County
Bayard
Creek Valley
Garden County
Leyton
Minatare
Potter-Dix
South Platte
MUDECAS (8)
Diller-Odell
Falls City Sacred Heart
Freeman
Lewiston
Nebraska City Lourdes
Parkview Christian
Pawnee City
Sterling
Niobrara Valley Conference (13)
Atkinson West Holt
Boyd County
Chambers/Wheeler Central
Clearwater/Orchard
Elgin/Elgin Pope John
Elkhorn Valley
Ewing
Neligh-Oakdale
Niobrara/Verdigre
North Central
O'Neill St. Mary's
Santee
Stuart
Panhandle Conference (5)
Crawford
Edgemont (South Dakota)
Hay Springs
Hemingford
Sioux County
Pioneer Conference (10)
Diller-Odell
Falls City Sacred Heart
Friend
Humboldt-Table Rock-Steinauer
Johnson-Brock
Lewiston
Nebraska City Lourdes
Pawnee City
Southern
Sterling
Republican Plains Activities Conference (15)
Alma
Arapahoe
Bertrand
Cambridge
Dundy County-Stratton
Hayes Center
Hitchcock County
Maxwell
Maywood
Medicine Valley
Paxton
Southern Valley
Southwest
Wallace
Wauneta-Palisade
River Cities Conference (8)
Beatrice
Elkhorn Mt. Michael
Omaha Duchesne
Omaha Gross
Omaha Roncalli
Omaha Skutt
Ralston
South Sioux City
South Platte Valley Association (7)
Bridgeport
Chase County
Hershey
Kimball
North Platte St. Patrick's
Perkins County
Sutherland
Southern Nebraska Conference (12)
Centennial
David City
Fairbury
Fillmore Central
Heartland
Milford
Sandy Creek
Superior
Sutton
Thayer Central
Tri County
Wilber-Clatonia
Southwest Conference (8)
Ainsworth
Broken Bow
Cozad
Gothenburg
McCook
Minden
Ogallala
Valentine
Twin Valley Conference (9)
Blue Hill
Deshler
Franklin
Harvard
Kenesaw
Lawrence-Nelson
Red Cloud
Shelton
Silver Lake
Western Conference (6)
Alliance
Chadron
Gering
Mitchell
Scottsbluff
Sidney
Western Trails Conference (7)
Bayard
Bridgeport
Gordon-Rushville
Hemingford
Kimball
Mitchell
Morrill