| Oxnard Guerreros FC | National Premier Soccer League | Temecula | 2016 | — |
| Pachuca Puerto Rico | Puerto Rico Soccer League | — | 2009 | Nestor Morales Stadium |
| Pago Youth FC | ASFA Soccer League | Pago Pago | — | Veterans Memorial Stadium |
| Paire FC | M*League Division 1 | Saipan | — | Oleai Sports Complex |
| Pali Blues | USL W-League | Los Angeles | 2008 | Palisades Charter High School |
| Panama City Beach Pirates | USL League Two | Panama City Beach | 2007 | Arnold High School |
| Panathinaikos Chicago | National Premier Soccer League | Naperville | 2020 | — |
| PanSa East F.C. | ASFA Soccer League | Pago Pago | — | Veterans Memorial Stadium |
| Park City Red Wolves SC | USL League Two | Park City | — | — |
| Pawtucket Rangers | — | Pawtucket | 1913 | — |
| PDX FC | National Premier Soccer League | Portland | 2017 | — |
| Pennsylvania Stoners | National Premier Soccer League | Allentown | 2007 | Whitehall High School |
| Pensacola FC | — | Pensacola | 2013 | — |
| Performance FC Phoenix | National Premier Soccer League | — | 2007 | — |
| Philadelphia Atoms SC | American Soccer League | — | 2017 | — |
| Philadelphia Charge | Women's United Soccer Association | — | 2 November 2000 | Villanova Stadium |
| Philadelphia Field Club | — | Philadelphia | 1921 | — |
| Philadelphia Fury | North American Soccer League | Philadelphia | 2014 | Veterans Stadium |
| Philadelphia Fury | North American Soccer League | — | 1978 | Veterans Stadium |
| Philadelphia Independence | Women's Professional Soccer | Philadelphia | 2009 | Farrell Stadium |
| Philadelphia Lone Star FC | National Premier Soccer League | Philadelphia | 2001 | — |
| Philadelphia Nationals | — | Philadelphia | 1936 | — |
| Philadelphia Spartans | National Professional Soccer League | Philadelphia | 1967 | Temple Stadium |
| Philadelphia Ukrainians | American Soccer League | Philadelphia | 1950 | — |
| Philadelphia Union | Major League Soccer | Chester | 2008 | Subaru Park |
| Philadelphia Union Reserves | MLS Reserve League | — | 2011 | — |
| Phoenix Banat Storm | National Premier Soccer League | — | 2006 | — |
| Phoenix FC | USL Championship | Phoenix | 2 July 2012 | Sun Devil Soccer/Lacrosse Stadium |
| Phoenix Inferno | Major Indoor Soccer League | Arizona | 1980 | Arizona Veterans Memorial Coliseum |
| Phoenix Monsoon | United Premier Soccer League, National Premier Soccer League | Arizona | 2010 | — |
| Phoenix Rising FC | USL Championship | Peoria | 13 March 2014 | Phoenix Rising Soccer Stadium, Peoria Sports Complex, Casino Arizona Field, Scottsdale Stadium |
| Pittsburgh Phantoms | National Professional Soccer League | Pittsburgh | 1967 | Forbes Field |
| Pittsburgh Riverhounds SC | USL Championship | Pittsburgh | 11 March 1998 | Highmark Stadium |
| Pittsburgh Stingers | Continental Indoor Soccer League | — | 1994 | Civic Arena |
| Pocono Snow | National Premier Soccer League | — | 2008 | — |
| Port City FC | National Premier Soccer League | — | 2016 | — |
| Portland Hearts of Pine | USL League One | — | 7 September 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 | Major League Soccer | Portland | 2009 | 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 |
| Prankton United | St Croix Soccer League | Frederiksted | — | — |
| 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 |