| ^Oakland Clippers (1967-1968) |
| ^Oakland Clippers (1967-1968) |
|
1967 NPSL
|
1968 NASL
|
|
| ^Oakland F.C. (1910-1911) |
| ^Oakland F.C. (1910-1911) |
|
1910-1911 BCSL
|
|
|
| ^Oakland Roots Sports Club (2019-None) |
| ^Oakland Roots S.C. (2019) |
|
2019-2020 NISA - Fall Showcase
|
2019-2020 NISA - Spring Season
|
2020-2021 NISA - Fall Season
|
|
| ^O'Brien Live Wires (1912-1913) |
| ^O'Brien Live Wires (1912-1913) |
|
1912-1913 StLAFL
|
|
|
| ^Occidental A.C. (1903-1905) |
| ^Occidental A.C. (1903-1905) |
|
1903-1904 CAFL
|
1904-1905 CAFL
|
|
| ^Ocean City Nor'easters (1997-None) |
| ^South Jersey Barons (1997-2004) |
|
1997 USISL D3-Pro
|
1998 USISL D3-Pro
|
1999 USL D3 Pro
|
|
| ^Oertli Markets (1935-1936) |
| ^Oertli Markets (1935-1936) |
|
1935-1936 MilMSL
|
|
|
| ^Ohio XOGGZ (1994-1998) |
| ^Ohio XOGGZ (1994-1996) |
| ^Columbus F.C. XOGGZ (1994-1995) |
|
1994 USISL
|
1995 USISL-Pro
|
|
| ^Ohio XOGGZ (1996-1996) |
|
1996 USISL-Select
|
|
|
| ^Columbus ZIGGX (1994-1998) |
|
1994 USWISL
|
1995 USWISL
|
1996 USWISL
|
1997 USISL W-League
|
|
1998 USISL W-League
|
|
|
| ^Okanagan Challenge S.C. (1990-2012) |
| ^Okanagan Challenge S.C. (1990-2012) |
|
1998 USISL PDSL
|
|
|
| ^Oklahoma City Hatters (1998-1998) |
| ^Oklahoma City Warriors/Hatters (1998-1998) |
|
1998 USISL PDSL
|
|
|
| ^Oklahoma City Heat (1996-1996) |
| ^Oklahoma City Heat (1996-1996) |
|
1996 USISL-Premier
|
|
|
| ^Oklahoma City Slickers (1982-1983) |
| ^Oklahoma City Slickers (1982-1983) |
|
1982 ASL
|
1983 ASL
|
|
| ^Oklahoma City Spirit S.C. (1990-None) |
| ^Oklahoma City Spirit S.C. (1990-1992) |
|
1990 LSSA
|
1991 LSSA
|
1992 LSSA
|
|
| ^Oklahoma City Warriors (1986-1998) |
| ^Oklahoma City Warriors (1986-1998) |
| ^Oklahoma City Warriors (1986-1993) |
|
1986-1987 SISL
|
1987-1988 SISL
|
1988-1989 SISL
|
1989 SOSL
|
|
1989-1990 SISL
|
1990 SISL
|
1990-1991 SISL
|
1991 SISL
|
|
1991-1992 USISL
|
1992 USISL
|
1992-1993 USISL
|
|
| ^Oklahoma City Slickers (1993-1993) |
|
1993 USISL
|
|
|
| ^Oklahoma City Warriors (1993-1994) |
|
1993-1994 USISL
|
|
|
| ^Oklahoma City Slickers (1994-1996) |
|
1994 USISL
|
1994-1995 USISL-Indoor
|
1995 USISL-Premier
|
1995-1996 USISL-Indoor
|
| ^Oklahoma City Alliance (1996-1998) |
|
1996-1997 USISL I-League
|
1997-1998 USISL I-League
|
|
| ^Oklahoma City Warriors (1998-1998) |
|
1997-1998 USISL I-League
|
|
|
| ^Oklahoma City Wind (1999-1999) |
| ^Oklahoma City Wind (1999-1999) |
|
1999 USL W-League
|
|
|
| ^O'Learys (1907-1912) |
| ^O'Learys (1907-1912) |
| ^Kinloch (1907-1909) |
|
1907-1908 AFLStL
|
|
|
| ^O'Learys (1910-1912) |
|
1910-1911 StLAFL - 1st Half
|
1911-1912 ASFL
|
|
| ^Olympia S.C. (1965-1967) |
| ^Olympia S.C. (1965-1967) |
|
1965-1966 ASL
|
1966-1967 ASL
|
|
| ^Olympic Club (1914-1921) |
| ^Olympic Club (1914-1921) |
|
1914-1915 CFL
|
1915-1916 CFL
|
1916-1917 CFL
|
1917-1918 CFL
|
|
1918 CFL
|
1918-1919 CFL
|
1919-1920 CFL
|
1920-1921 CFL
|
| ^Omaha Flames (1996-1998) |
| ^Omaha Flames (1996-1998) |
|
1996 USISL-Premier
|
1996-1997 USISL I-League
|
1997 USISL PDSL
|
1997-1998 USISL I-League
|
| ^Orange County Blue Star (1997-2012) |
| ^Orange County Zodiac (1997-1999) |
|
1997 USISL A-League
|
1998 USISL A-League
|
1999 USL A-League
|
|
| ^Orlando City U-23 (1998-2015) |
| ^Orlando City U-23 (1998-2011) |
| ^Central Florida Lionhearts (1998-1998) |
|
1998 USISL PDSL
|
|
|
| ^Central Florida Kraze (1999-2011) |
|
1999 USL PDL
|
|
|
| ^Orlando Lions (1992-1996) |
| ^Orlando Lions (1992-1996) |
|
1992 USISL
|
1993 USISL
|
1993-1994 USISL
|
1994 USISL
|
|
1995 USISL-Premier
|
1995-1996 USISL-Indoor
|
1996 USISL-Premier
|
|
| ^Orlando Lions (1994-1994) |
|
1994 USWISL
|
|
|
| ^Orlando Lions S.C. (1986-1990) |
| ^Orlando Lions (1986-1990) |
|
1988 ASL
|
1989 ASL
|
1990 APSL
|
1994-1995 USISL-Indoor
|
| ^Orlando Nighthawks (1997-1999) |
| ^Orlando Nighthawks (1997-1999) |
| ^Daytona Tigers (1997-1997) |
|
1997 USISL D3-Pro
|
|
|
| ^Orlando Nighthawks (1998-1999) |
|
1998 USISL D3-Pro
|
1999 USL PDL
|
|
| ^Orlando Ladyhawks (1998-1998) |
|
1998 USISL W-League
|
|
|
| ^Orlando Sundogs (1997-1997) |
| ^Orlando Sundogs (1997-1997) |
|
1997 USISL A-League
|
|
|
| ^Oscar Mayer Co. (1934-1936) |
| ^Oscar Mayer Co. (1934-1936) |
|
1934 MadMSL
|
1935-1936 EWSFL
|
1936-1937 WSSFL
|
|
| ^Oshkosh Sport Club (1927-1964) |
| ^Oshkosh Sport Club (1927-1938) |
|
1928 EWSFL
|
1929 EWSFL
|
1929-1930 EWSFL
|
1930-1931 EWSFL
|
|
1931-1932 EWSFL
|
1932-1933 EWSFL
|
1933-1934 EWSFL
|
1934-1935 EWSFL
|
|
1935-1936 EWSFL
|
1937 CWSFL
|
1938 CWSFL
|
|
| ^Oshkosh Sport Club 2nd (1932-1934) |
|
1932-1933 EWSFL
|
1933-1934 EWSFL
|
|
| ^Oshkosh Aurochs (1954-1964) |
|
1955 WSSL
|
1956 WSSL
|
1957 WSSL
|
|