| Baltimore Bays | National Professional Soccer League | Baltimore | 1967 | Memorial Stadium |
| Baltimore Blast | — | — | 1980 | CFG Bank Arena |
| Baltimore Blast | Major Indoor Soccer League, Major Arena Soccer League | Baltimore | 1992 | CFG Bank Arena, SECU Arena |
| Baltimore Bohemians | USL League Two | — | 2011 | Cedar Lane |
| 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 |
| Bavarian United SC | National Premier Soccer League | Milwaukee | 1929 | — |
| 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 | April 4, 2023 | PayPal Park |
| Bayamón FC | Liga Nacional de Fútbol de Puerto Rico | Bayamón | 1999 | Juan Ramón Loubriel Stadium |
| 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 | — |
| Birmingham Legion FC | USL Championship | Birmingham | 2017 | PNC Field |
| Black Roses | ASFA Soccer League | Pago Pago | 2007 | Veterans Field |
| Boca Raton FC | National Premier Soccer League | Boca Raton | 2015 | Atlantic Community High School |
| Boston Astros | — | Boston | 1969 | — |
| Boston Aztec | National Premier Soccer League | — | 2006 | — |
| Boston Bolts | USL League Two | — | 2015 | — |
| Boston Bolts | — | Boston | 1988 | — |
| Boston Breakers | National Women's Soccer League | Boston | October 26, 2008 | Harvard Stadium, Dilboy Stadium |
| Boston Bulldogs | A-League | Boston | 1996 | — |
| 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 Soccer Club | — | Boston | 1924 | — |
| Boston Storm | — | Boston | 1993 | — |
| Boston Tea Men | — | North Andover | 2009 | — |
| 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 |
| 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 | — |