272 teams have registered:

• Adlai E. Stevenson (Lincolnshire, IL)
• Amador Valley (Pleasanton, CA)
• American Heritage-Plantation (Plantation, FL)
• Arcadia A (Arcadia, CA)
• Arcadia B (Arcadia, CA)
• Bainbridge (Bainbridge, GA)
• Ballard (Louisville, KY)
• Beachwood (Beachwood, OH)
• Bellarmine College Prep A (San Jose, CA)
• Bellarmine College Prep B (San Jose, CA)
• Belvidere North (Belvidere, IL)
• Bishop Heelan (Sioux City, IA)
• Bloomington (Bloomington, IL)
• Brookwood (Snellville, GA)
• Buchholz (Gainesville, FL)
• Burnsville A (Burnsville, MN)
• Burnsville B (Burnsville, MN)
• Campbell County (Alexandria, KY)
• Carbondale A (Carbondale, IL)
• Carbondale B (Carbondale, IL)
• Cave Spring A (Roanoke, VA)
• Cave Spring B (Roanoke, VA)
• Cedar Crest (Lebanon, PA)
• Cedar Shoals (Athens, GA)
• Centennial (Ellicott City, MD)
• Chanhassen A (Chanhassen, MN)
• Chanhassen B (Chanhassen, MN)
• Chartiers Valley (Bridgeville, PA)
• Chaska (Chaska, MN)
• Chattahoochee A (Johns Creek, GA)
• Chattahoochee B (Johns Creek, GA)
• Chillicothe (Chillicothe, OH)
• Cinco Ranch (Katy, TX)
• Cistercian A (Irving, TX)
• Cistercian B (Irving, TX)
• Clark (San Antonio, TX)
• Clay (South Bend, IN)
• Cloverleaf (Lodi, OH)
• Collins Hill A (Suwanee, GA)
• Collins Hill B (Suwanee, GA)
• Copley (Copley, OH)
• Corbin (Corbin, KY)
• Corona del Sol A (Tempe, AZ)
• Corona del Sol B (Tempe, AZ)
• Crystal Springs Uplands (Hillsborough, CA)
• Davis A (Davis, CA)
• Davis B (Davis, CA)
• De Smet (St. Louis, MO)
• DeLaSalle A (Minneapolis, MN)
• DeLaSalle B (Minneapolis, MN)
• Desert Vista A (Phoenix, AZ)
• Desert Vista B (Phoenix, AZ)
• Detroit Catholic Central A (Novi, MI)
• Detroit Catholic Central B (Novi, MI)
• Detroit Catholic Central C (Novi, MI)
• Discovery (Newton, NC)
• Dorman A (Roebuck, SC)
• Dorman B (Roebuck, SC)
• Dublin Scioto (Dublin, OH)
• Dunbar A (Lexington, KY)
• Dunbar B (Lexington, KY)
• Dunwoody (Dunwoody, GA)
• duPont Manual A (Louisville, KY)
• duPont Manual B (Louisville, KY)
• E. O. Smith (Storrs-Mansfield, CT)
• Early College at Guilford A (Greensboro, NC)
• Early College at Guilford B (Greensboro, NC)
• Eastview (Apple Valley, MN)
• Eau Claire Regis (Eau Claire, WI)
• Eden Prairie A (Eden Prairie, MN)
• Eden Prairie B (Eden Prairie, MN)
• Edmond Memorial (Edmond, OK)
• Edmond Santa Fe (Edmond, OK)
• EIS (San Pedro Sula, Honduras)
• Enid (Enid, OK)
• Essex A (Essex Junction, VT)
• Essex B (Essex Junction, VT)
• Ezell-Harding (Antioch, TN)
• Farragut (Knoxville, TN)
• Fenton (Bensenville, IL)
• Fenwick A (Oak Park, IL)
• Fenwick B (Oak Park, IL)
• Fisher Catholic (Lancaster, OH)
• Flowery Branch (Flowery Branch, GA)
• Fountain Lake (Hot Springs, AR)
• Fremont Scholars
• Galloway (Atlanta, GA)
• Gatton Academy (Bowling Green, KY)
• George Washington (Charleston, WV)
• Georgetown Day (Washington, DC)
• Germantown A (Germantown, TN)
• Germantown B (Germantown, TN)
• Glasgow (Glasgow, KY)
• Gotham Scholars
• Grand Junction (Grand Junction, CO)
• Grants Pass (Grants Pass, OR)
• Greenhill (Addison, TX)
• Grosse Pointe North (Grosse Pointe Woods, MI)
• Hallsville (Hallsville, MO)
• Harmony Science North Austin (Pflugerville, TX)
• Helias (Jefferson City, MO)
• Hickman (Columbia, MO)
• High Tech A (Lincroft, NJ)
• High Tech B (Lincroft, NJ)
• Hinsdale Central A (Hinsdale, IL)
• Hinsdale Central B (Hinsdale, IL)
• Hoover A (Hoover, AL)
• Hoover B (Hoover, AL)
• Hudson A (Hudson, WI)
• Hudson B (Hudson, WI)
• Hume-Fogg (Nashville, TN)
• Hunter A (New York, NY)
• Hunter B (New York, NY)
• IMSA A (Aurora, IL)
• IMSA B (Aurora, IL)
• Indiana Area (Indiana, PA)
• Irondale (New Brighton, MN)
• Irvine (Irvine, CA)
• Itawamba Agricultural (Fulton, MS)
• Ithaca A (Ithaca, NY)
• Ithaca B (Ithaca, NY)
• J. M. Tate A (Cantonment, FL)
• J. M. Tate B (Cantonment, FL)
• Keith Country Day (Rockford, IL)
• La Crosse Logan (La Crosse, WI)
• La Jolla A (La Jolla, CA)
• La Jolla B (La Jolla, CA)
• Ladue (St. Louis, MO)
• Lakeside (Seattle, WA)
• LAMP (Montgomery, AL)
• LASA A (Austin, TX)
• LASA B (Austin, TX)
• LASA C (Austin, TX)
• LASA D (Austin, TX)
• LASA E (Austin, TX)
• Latin School (Chicago, IL)
• Lexington (Lexington, MA)
• Lisgar (Ottawa, ON, Canada)
• Livingston A (Livingston, NJ)
• Livingston B (Livingston, NJ)
• Livonia Churchill (Livonia, MI)
• Loyola Academy A (Wilmette, IL)
• Loyola Academy B (Wilmette, IL)
• MacArthur (San Antonio, TX)
• Maclay (Tallahassee, FL)
• Madison (San Diego, CA)
• Maggie Walker Governor's School (Richmond, VA)
• Manheim Township (Lancaster, PA)
• Marist (Atlanta, GA)
• MAST (Highlands, NJ)
• Menlo (Atherton, CA)
• Metea Valley (Aurora, IL)
• Millbrook (Raleigh, NC)
• Minnetonka A (Minnetonka, MN)
• Minnetonka B (Minnetonka, MN)
• Mira Loma (Sacramento, CA)
• Mounds Park (St. Paul, MN)
• Mounds View (Arden Hills, MN)
• Mount Rainier (Des Moines, WA)
• Mountain Lakes (Mountain Lakes, NJ)
• Myrtle Beach (Myrtle Beach, SC)
• Norman (Norman, OK)
• Norman North A (Norman, OK)
• Norman North B (Norman, OK)
• North Kansas City (North Kansas City, MO)
• North Miami (Denver, IN)
• North White A (Monon, IN)
• North White B (Monon, IN)
• Northmont A (Clayton, OH)
• Northmont B (Clayton, OH)
• Oak Park-River Forest (Oak Park, IL)
• Oakland Mills (Columbia, MD)
• Olmsted Falls (Olmsted Falls, OH)
• Palo Alto (Palo Alto, CA)
• Parish Episcopal (Dallas, TX)
• Park Hill South (Riverside, MO)
• Parkway Central (Chesterfield, MO)
• Phoenixville A (Phoenixville, PA)
• Phoenixville B (Phoenixville, PA)
• Pickens Academy (Carrollton, AL)
• Pinewood Prep (Summerville, SC)
• Portsmouth Christian (Dover, NH)
• Providence (Charlotte, NC)
• Quince Orchard (Gaithersburg, MD)
• Raleigh Charter (Raleigh, NC)
• Rancho Bernardo (San Diego, CA)
• Ransom Everglades A (Coconut Grove, FL)
• Ransom Everglades B (Coconut Grove, FL)
• Ransom Everglades C (Coconut Grove, FL)
• Richard Montgomery (Rockville, MD)
• Ridgewood (Norridge, IL)
• River Ridge (Woodstock, GA)
• Riverside (Greer, SC)
• Robbinsdale Armstrong (Plymouth, MN)
• Rock Bridge (Columbia, MO)
• Rockford Auburn A (Rockford, IL)
• Rockford Auburn B (Rockford, IL)
• Rockford Auburn C (Rockford, IL)
• Ronald Reagan A (San Antonio, TX)
• Ronald Reagan B (San Antonio, TX)
• Rosemount (Rosemount, MN)
• Russell (Russell, KY)
• Saint Joseph (South Bend, IN)
• San Diego Scholars
• San Ramon Scholars
• Santa Monica A (Santa Monica, CA)
• Santa Monica B (Santa Monica, CA)
• Savannah (Savannah, MO)
• Seven Lakes (Katy, TX)
• Shippensburg Area (Shippensburg, PA)
• Sidney (Sidney, OH)
• Skyline (Ann Arbor, MI)
• Solon (Solon, OH)
• South Burlington (South Burlington, VT)
• South Glens Falls (South Glens Falls, NY)
• South Range (Canfield, OH)
• Springfield (Springfield, IL)
• Springwood (Lanett, AL)
• St. Andrew's (Ridgeland, MS)
• St. John's A (Houston, TX)
• St. John's B (Houston, TX)
• St. Mark's School of Texas (Dallas, TX)
• St. Paul Academy (St. Paul, MN)
• St. Paul Central (St. Paul, MN)
• St. Paul's Episcopal (Mobile, AL)
• St. Thomas Academy (Mendota Heights, MN)
• State College A (State College, PA)
• State College B (State College, PA)
• Stephens County (Toccoa, GA)
• Stillman Scholars
• Stoughton (Stoughton, WI)
• Thomas County Central (Thomasville, GA)
• Thomas Jefferson Classical (Mooresboro, NC)
• Thomas Jefferson Science & Tech (Alexandria, VA)
• Tippecanoe (Tipp City, OH)
• Torrey Pines (San Diego, CA)
• Treasure Valley (Boise, ID)
• Troy (Troy, MI)
• Tuscumbia (Tuscumbia, MO)
• UChicago Lab (Chicago, IL)
• Union Pines (Cameron, NC)
• University Lab (Urbana, IL)
• University School of Nashville (Nashville, TN)
• Utica Academy A (Sterling Heights, MI)
• Utica Academy B (Sterling Heights, MI)
• Valdosta (Valdosta, GA)
• Verrado (Buckeye, AZ)
• Village (Houston, TX)
• Walter Johnson (Bethesda, MD)
• Watson Chapel A (Pine Bluff, AR)
• Watson Chapel B (Pine Bluff, AR)
• Waverly (Waverly, OH)
• Wayzata A (Plymouth, MN)
• Wayzata B (Plymouth, MN)
• Wayzata C (Plymouth, MN)
• Wayzata D (Plymouth, MN)
• West Point A (Cullman, AL)
• West Point B (Cullman, AL)
• West Salem A (West Salem, WI)
• West Salem B (West Salem, WI)
• Western Albemarle (Crozet, VA)
• Westview (Portland, OR)
• Wheaton North (Wheaton, IL)
• Wheaton Warrenville South (Wheaton, IL)
• White Station (Memphis, TN)
• William Fremd (Palatine, IL)
• Willow (New Orleans, LA)
• Wilmington Charter A (Wilmington, DE)
• Wilmington Charter B (Wilmington, DE)
• Winchester Thurston (Pittsburgh, PA)
• Ysleta A (El Paso, TX)
• Ysleta B (El Paso, TX)

The field is capped at 272 teams.