| Pittsburgh Stingers | Continental Indoor Soccer League | — | 1994 | Civic Arena |
| Pocono Snow | National Premier Soccer League | — | 2008 | — |
| Ponta Delgada S.C. | — | Hartford | — | Mark's Stadium |
| Port City FC | National Premier Soccer League | — | 2016 | — |
| Portland Hearts of Pine | USL League One | — | September 7, 2023 | Fitzpatrick Stadium |
| Portland Pride | Continental Indoor Soccer League | — | 1993 | Veterans Memorial Coliseum |
| Portland Pythons | World Indoor Soccer League | — | 1998 | Moda Center |
| Portland Thorns FC | National Women's Soccer League | Portland | 2012 | Providence Park |
| Portland Timbers | North American Soccer League | Portland | 1975 | Providence Park |
| Portland Timbers | A-League | — | 2001 | Providence Park |
| Portland Timbers U23s | USL League Two | — | 2008 | Providence Park |
| Providence F.C. | — | Providence | 1924 | — |
| Puerto Rico Capitals | Women's Premier Soccer League | — | 2007 | Parque Yldefonso Solá Morales |
| Puerto Rico FC | North American Soccer League | Bayamón | 2015 | Juan Ramón Loubriel Stadium |
| Puerto Rico Islanders | North American Soccer League | Bayamón | 2003 | Juan Ramón Loubriel Stadium |
| Puerto Rico United | USL Championship, Puerto Rico Soccer League | Aguada | 2007 | Aguada Stadium |
| Puget Sound Gunners FC | USL League Two | — | 2010 | Issaquah High School |
| Puget Sound Soccer Academy Rapids | Pacific Coast Soccer League | — | 2001 | — |
| Pumas FC | National Premier Soccer League | Birmingham | 1999 | — |
| Quality Distributors | Guam Men's Soccer League | Guam | 2001 | — |
| Queensboro FC | USL Championship | Queens | November 12, 2019 | — |
| Racing Louisville FC | National Women's Soccer League | Louisville | October 22, 2019 | Lynn Family Stadium |
| Raleigh Express | A-League | Raleigh | 1993 | — |
| Rayo OKC | North American Soccer League | Oklahoma City | 2015 | Yukon High School |
| Reading United AC | USL League Two | Reading | 1996 | — |
| Real Boston Rams | USL League Two | — | 2012 | Veterans Memorial Stadium |
| Real Colorado Cougars | USL W-League | — | 2003 | — |
| Real Madrid | Puerto Rico Soccer League | — | 2009 | Juan Ramón Loubriel Stadium |
| Real Maryland F.C. | USL League Two | Rockville | 2007 | Richard Montgomery High School |
| Real Phoenix FC | Major Arena Soccer League | Arizona | 2012 | — |
| Real Salt Lake | Major League Soccer | Salt Lake City | 2005 | America First Field |
| Real San Jose | National Premier Soccer League | San Jose | 2007 | PAL Stadium |
| Real Shore F.C. | National Premier Soccer League | — | 2006 | — |
| Red Bull New York | Major League Soccer | Harrison | 1995 | Giants Stadium, Sports Illustrated Stadium |
| Red Force FC | American Premier Soccer League | Miami | 2009 | Tropical Park Stadium |
| Redwood City Ruckus | National Premier Soccer League | — | 2006 | — |
| Reno 1868 FC | USL Championship | Reno | September 16, 2015 | Greater Nevada Field |
| Rhode Island Oceaneers | — | Pawtucket | 1974 | — |
| Rhode Island Stingrays | USL League Two | — | 1995 | — |
| RI Reds | National Premier Soccer League | Rhode Island | 2012 | — |
| Richmond Kickers | USL League One | Richmond | 1993 | City Stadium |
| Richmond Kickers Academy | U.S. Soccer Development Academy | — | 2008 | — |
| Rio Grande Valley Bravos FC | USL League Two | — | 2008 | — |
| Rio Grande Valley FC Toros | USL Championship | Edinburg | July 15, 2015 | Robert and Janet Vackar Stadium |
| Rio Grande Valley Ocelots FC | National Premier Soccer League | — | 2010 | — |
| River Cities Futbol Club | Women's Premier Soccer League | — | 2004 | — |
| Riverside County Elite | USL Second Division | — | 1998 | West Valley High School |
| Rochester Flash | American Soccer League | Rochester | 1981 | Holleder Memorial Stadium |