| Baltimore Comets | North American Soccer League | Baltimore | 1974 | Memorial Stadium |
| Baltimore Flyers | — | Baltimore | 1966 | — |
| Baltimore Pompei | — | Baltimore | 1953 | — |
| Baltimore S.C. | — | Baltimore | 1943 | — |
| Bank of Guam Strykers FC | Guam Men's Soccer League | — | 2005 | — |
| Baton Rouge Bombers | Eastern Indoor Soccer League | — | 1997 | Baton Rouge River Center Arena |
| Baton Rouge Capitals | USL League Two | Baton Rouge | 2007 | Christian Life Academy |
| Bay Area Ambassadors | National Premier Soccer League | — | 2009 | Chabot College |
| Bay Area Breeze | USL W-League | Hayward | 2011 | Pioneer Stadium |
| Bay FC | National Women's Soccer League | San Francisco | 4 April 2023 | PayPal Park |
| Ben Millers | — | St. Louis | 1913 | — |
| Bermuda Hogges | USL League Two | Pembroke Parish | 2006 | Bermuda National Stadium |
| Bethlehem Hungarian | — | Bethlehem | 1938 | — |
| Bethlehem Steel F.C. | American Soccer League | Bethlehem | 1907 | — |
| Birmingham Hammers | USL League Two | Birmingham | 2013 | — |
| Black Roses | ASFA Soccer League | Pago Pago | 2007 | Veterans Field |
| Boston Aztec | National Premier Soccer League | — | 2006 | — |
| Boston Beacons | North American Soccer League | Boston | 1967 | Fenway Park |
| Boston Beaneaters | — | Boston | 1894 | — |
| Boston Bolts | USL League Two | — | 2015 | — |
| Boston Bolts | — | Boston | 1988 | — |
| Boston Breakers | National Women's Soccer League | Boston | 26 October 2008 | Harvard Stadium, Dilboy Stadium |
| Boston Breakers | Women's United Soccer Association | Boston | 2000 | Nickerson Field |
| Boston Bulldogs | A-League | Boston | 1996 | — |
| Boston City FC | — | Malden | 2015 | — |
| Boston Legacy FC | National Women's Soccer League | — | 2023 | White Stadium |
| Boston Minutemen | North American Soccer League | Boston | 1974 | Alumni Stadium |
| Boston Rovers | — | — | 1966 | Manning Bowl |
| Boston Storm | — | Boston | 1993 | — |
| Boston Tigers | — | Boston | 1963 | — |
| Boston Victory S.C. | USL League Two | — | 2011 | Veterans Memorial Stadium |
| Brave SC | USL League Two | The Villages | 2008 | — |
| Brazos Valley Cavalry F.C. | USL League Two | Bryan | 2017 | Travis Field |
| Brookhattan | American Soccer League | New York City | 1938 | — |
| Brooklyn Celtic | — | New York City | 1908 | — |
| Brooklyn FC | USL Super League | Brooklyn | — | — |
| Brooklyn Field Club | American Soccer League | New York City | 1898 | — |
| Brooklyn Grooms FC | — | Brooklyn | 1893 | — |
| Brooklyn Hakoah | — | New York City | 1929 | — |
| Brooklyn Italians | National Premier Soccer League | New York City | 1949 | John Dewey High School |
| Brooklyn Knights | USL League Two | — | 1999 | Metropolitan Oval |
| Brooklyn Robins Dry Dock | — | New York City | 1918 | — |
| Brooklyn Wanderers | — | New York City | 1894 | — |
| Brownsville Barracudas | Major Arena Soccer League | — | 2014 | Payne Arena |
| Buffalo City FC | National Premier Soccer League | — | 2008 | Nichols School |
| Buffalo FFillies | — | Buffalo | 1996 | — |
| Buffalo Pro Soccer | USL Super League, USL Championship | Buffalo | 2024 | Queen City Field |
| Buffalo Stallions | Major Indoor Soccer League | Buffalo | 1979 | Buffalo Memorial Auditorium |