The following conferences and schools have contracted the CBUAO to provide certified college baseball umpires:
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 America East: Albany, Binghamton, Hartford, Maine, UMBC, Stony Brook, Vermont
 Atlantic 10 Conference: Charlotte, Dayton, Duquesne, Fordham, George Washington, La Salle, Massachusetts, Rhode Island, Richmond, St. Bonaventure, Saint Joseph's, Saint Louis, Temple, Xavier
 Big East Conference: Cincinnati, UConn, Georgetown, Louisville, Notre Dame, Pittsburgh, Villanova, Seton Hall, USF, Rutgers, West Virginia, St. Johns
 Ivy League: Harvard, Princeton, Yale, Brown, Columbia, Cornell, Dartmouth, Penn
 Metro Atlantic Athletic Conference: Iona, Fairfield, Canisius, Siena, Saint Peter's, Rider, Niagara, Marist, Manhattan
 Northeast Conference: Bryant, Central Conn St., Quinnipiac, Wagner, Monmouth, Sacred Heart, Mount St. Mary's, Long Island, Fairleigh Dickinson
 Patriot League: American, Army, Bucknell, Colgate, Holy Cross, Lafayette, Lehigh, Navy
 Northeast-10 Conference: Adelphi, American International, Assumption, Bentley, Franklin Pierce, Merrimack, New Haven, Pace, Saint Anselm, Saint Rose, Southern Connecticut, Southern New Hampshire, Stonehill, UMass Lowell
 East Coast Conference: Bridgeport, C.W. Post, Dowling, Mercy, Molloy, Queens (N.Y.), Saint Thomas Aquinas
 Commonwealth Coast Conference: Endicott, Salve Regina, Curry, Eastern Nazarene, Nichols, Colby-Sawyer, Roger Williams, Anna Maria, Gordon, Wentworth, New England College and Western New England College.
 NJCAA Region XXI: Bunker Hill Community College, Community College of Rhode Island, Dean College, Gateway Community College, Holyoke Community College, Manchester Community College, Massachusetts Bay Community College, Massasoit Community College, Northern Essex Community College, Quinsigamond Community College, Roxbury Community, College, Springfield Technical Community College, University of Connecticut at Avery Point
 New England Collegiate Baseball League Bristol Collegiate, Danbury Westerners, Holyoke Blue Sox, Keene Swamp Bats, Laconia Muskrats, Lowell All Americans, New Bedford Bay Sox, Newport Gulls, North Adams Steeple Cats, North Shore Navigators, Sanford Mainers & Vermont Mountaineers
 New Jersey Athletic Conference William Patterson, Montclair State, The College of New Jersey, Kean, Rowan, Rutgers-Newark, Rutgers-Camden, Richard Stockton, Ramapo, New Jersey City
 Liberty League Clarkson, Rensselaer, Rochester, St. Lawrence, Skidmore, Union, Vassar
 New England Woman's and Men's Athletic Conference Babson, MIT, Springfield College, Wheaton, Coast Guard, WPI, and Clark
 North Eastern Athletic Conference Cazenovia, Keuka, D’Youville, UMaine Farmington, SUNY-Cobleskill and SUNYIT
 Freedom Conference Fairleigh Dickinson-College at Florham, Manhattanville
 New England Small College Athletic Conference Amherst, Bates, Bowdoin, Colby, Connecticut College, Hamilton, Middlebury, Trinity, Tufts, Wesleyan, Williams
 State University of New York Athletic Conference Brockport, Cortland, Fredonia, New Paltz, Oneonta, Oswego and Plattsburg
  An alliance has been formed between the International League, the Eastern League and the Carolina League, and the CBUAO whereby the CBUAO will provide umpires, on a fill in basis, for the three professional leagues during the 2007 season. Many times during the course of a season an opening will exist due to illness, injury, or promotion of an umpire to a higher level. In these situations, the CBUAO will be the official provider of umpires for the International League (AAA), the Eastern League (AA) and the Carolina League (A).
 NJCAA Region III Adirondack CC, Alfred State, Broome CC, Columbia-Greene CC, Corning CC, Erie CC, Finger Lakes CC,
Fulton Montgomery CC, Genesee CC, Herkimer CC, Hudson Valley CC, Jamestown CC, Jefferson CC, Mercyhurst Northeast,
Mohawk Valley CC, Monroe CC, Morrisville, SUNY, Niagara CC, Onondaga CC, Schenectady CC, Clinton Community College,
SUNY-Canton. SUNY-Cobleskill, Tompkins Cortland CC
- The following Leagues have joined our summer baseball assigning coalition: Boston Park League, Cranberry League, Intercity League, Yawkey League, American Legion (District 10), Stan Musial Baseball, Boston Men's Baseball League, Boston Men's Adult Baseball League and the North Shore Baseball League.
 Colonial Athletic Association Delaware, George Mason, Georgia State, Hofstra, James Madison, UNC Wilmington, Northeastern, Old Dominion, Towson, VCU and William & Mary
 Atlantic Coast Conference Boston College.
 Empire 8 Conference Ithaca, RIT, St. John Fisher, Steven’s Institute of Technology & Utica
 Central Athletic Collegiate Conference Bloomfield, Caldwell, Chestnut Hill, Concordia, Dominican, Felician, Nyack, Philadelphia, Post, University of Sciences, and Wilmington
 North Atlantic Conference Becker, Castleton State, Husson, Maine-Farmington and Thomas
 Great Northeast Athletic Conference Albertus Magnus, Johnson & Wales, Lasell, Norwich, Rivier, St. Joseph’s (Maine), Suffolk, Emerson
 Great West NJIT & NYIT
- Independent Schools
 Briarcliff College
 Brandeis University
 Cape Cod Baseball League
Bourne Braves, Brewster Whitecaps, Chatham Anglers, Cotuit Kettleers, Falmouth Commodores, Harwich Mariners, Hyannis Harbor Hawks, Orleans Firebirds, Wareham Gatemen, Y-D Red Sox
 Eastern Pennsylvania Collegiate Conference Bucks County Community College, Community College of Philadelphia, Delaware County Community College
 Skyline Conference Farmingdale State, SUNY Maritime, Mount Saint Mary (NY), Mount Saint Vincent, Old Westbury, Polytechnic, Purchase, St. Joseph’s-L.I., Yeshiva.
 Massachusetts State College Athletic Conference (MASCAC) Bridgewater, Fitchburg, Framingham, Mass. Maritime, MCLA, Salem, Westfield & Worcester State
 The Little East Conference Eastern Connecticut, Keene State College, Southern Maine, Rhode Island College, UMass Boston, Plymouth State, UMass Dartmouth & Western Connecticut
 NJCAA Region 19 Serving eastern PA, NJ and Delaware
 Landmark Conference Drew University and the U.S. Merchant Marine Academy, King's Point, N.Y
 CUNY Athletic Conference Baruch, CCNY, CSI, John Jay, Lehman
 New England Collegiate Conference Becker, Daniel Wester, Elms, Mitchell, Newbury, Southern Vermont
 Penn State University Athletic Conference Penn State- Abington and Penn State-Brandywine
 Sunrise Conference Fisher, Suny-Canton, and Maine-Presque Isle
 Atlantic Collegiate Baseball Leauge Long Island Locations
 Independent School Leauge
Belmont Hill School, Buckingham Browne & Nichols, Brooks School, Governor's Academy, Groton School, Lawrence Academy at Groton, Middlesex School, Milton Academy, Noble and Greenough School, Rivers School, Roxbury Latin School, St. George's School, St. Mark's School, St. Paul's School, St. Sebastian's School and Thayer Academy
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