| Fredericksburg Gunners | USL League Two | — | 2006 | Fredericksburg Academy |
| Fredericksburg Hotspur | USL League Two | — | 2010 | — |
| Fresno Fuego | USL League Two | Fresno | 2003 | Chukchansi Park |
| Galveston Pirate SC | National Premier Soccer League | — | 2010 | — |
| Georgia FC | — | Atlanta | — | Atlanta Silverbacks Park |
| Georgia Generals | — | Atlanta | 1982 | — |
| Georgia Revolution | National Premier Soccer League | McDonough | 2010 | Henry County High School |
| Gigantes de Carolina FC | Puerto Rico Soccer League | Carolina | 2008 | Roberto Clemente Stadium |
| Gold Star FC Detroit | National Independent Soccer Association | — | 2022 | — |
| Golden Gate Gales | — | Oakland | 1980 | — |
| Gorge FC | National Premier Soccer League | — | 2014 | — |
| Gotham FC | National Women's Soccer League | Whippany | 2006 | Sports Illustrated Stadium |
| GPS Portland Phoenix | USL League Two | Portland | 2009 | Memorial Stadium |
| Grand Rapids Alliance | National Premier Soccer League | — | 2002 | — |
| Greek-American A.C. | San Francisco Soccer Football League | San Francisco | 1949 | Boxer Stadium |
| Greenville Triumph SC | USL League One | Greenville | 13 March 2018 | — |
| Gremio Lusitano | — | — | 1922 | Lusitano Stadium |
| Guaynabo Fluminense FC | Puerto Rico Soccer League | Guaynabo | 2002 | Estadio José "Pepito" Bonano |
| Hakoah All-Stars | — | New York City | 1929 | — |
| Harrisburg City Islanders | — | Harrisburg | 2004 | Skyline Sports Complex, FNB Field |
| Harrisburg Heat | National Professional Soccer League | — | 1991 | Pennsylvania Farm Show Complex & Expo Center |
| Hartford Athletic | USL Championship | Hartford | 11 July 2018 | Trinity Health Stadium |
| Hartford City FC | National Premier Soccer League | Hartford | 2015 | — |
| Hartford Hellions | Major Indoor Soccer League | — | 1978 | — |
| Hartford S.C. | American Soccer League | Hartford | — | — |
| Helenites | St Croix Soccer League | — | 1990 | — |
| Hershey Wildcats | A-League | — | 1997 | Hersheypark Stadium |
| Hidalgo La Fiera | Major Arena Soccer League | — | 2012 | Payne Arena |
| Hollywood United F.C. | — | Hollywood | 1988 | Crossroads School for Arts & Sciences |
| Holyoke Falcos | American Soccer League | Holyoke | — | — |
| Houston Dash | National Women's Soccer League | Houston | 2013 | Shell Energy Stadium |
| Houston Dynamo FC | Major League Soccer | Houston | 2005 | Shell Energy Stadium |
| Houston Dynamos | Lone Star Soccer Alliance, United Soccer League | Houston | 1983 | — |
| Houston FC | United Premier Soccer League, USL League Two | Houston | 2016 | — |
| Houston Hotshots | Continental Indoor Soccer League | — | 1994 | Lakewood Church Central Campus |
| Houston Hurricane | North American Soccer League | Houston | 1978 | Astrodome |
| Houston Hurricanes FC | National Premier Soccer League | — | December 2012 | Lutheran South Academy |
| Houston Leones | USL League Two | — | 2007 | — |
| Houston Stars | North American Soccer League | Houston | 1967 | Astrodome |
| Houston Toros | USL League Two | — | 2002 | — |
| Huntsville Fire | Eastern Indoor Soccer League | — | 1997 | Von Braun Center |
| Huracán FC de Caguas | Puerto Rico Soccer League | Caguas | 1991 | Parque Yldefonso Solá Morales |
| Icon FC | American Soccer League | — | 2010 | — |
| Idaho Wolves | National Premier Soccer League | — | 2004 | — |
| IFC Wild Bills | M*League Division 1 | — | 2007 | Oleai Sports Complex |
| Illinois Piasa | Major Arena Soccer League | — | 2007 | — |
| IMG Academy Bradenton | USL League Two | Bradenton | 1998 | — |
| Indiana Blast | A-League, USL League Two | — | 1997 | Kuntz Stadium |