American soccer writing, history & data.
| Club | From | To |
|---|---|---|
| O'Brien Live Wires | 1912 | 1913 |
| O'Learys | 1907 | 1912 |
| Oakland Clippers | 1967 | 1968 |
| Oakland F.C. | 1910 | 1911 |
| Oakland Roots Sports Club | 2019 | None |
| Occidental A.C. | 1903 | 1905 |
| Ocean City Nor'easters | 1997 | None |
| Oertli Markets | 1935 | 1936 |
| Oklahoma City Heat | 1996 | 1996 |
| Oklahoma City Slickers | 1982 | 1983 |
| Oklahoma City Spirit S.C. | 1990 | None |
| Oklahoma City Warriors | 1986 | 1998 |
| Olympia S.C. | 1965 | 1967 |
| Olympic Club | 1914 | 1921 |
| Omaha Flames | 1996 | 1998 |
| Orange County Blue Star | 1997 | 2012 |
| Orlando Lions | 1992 | 1996 |
| Orlando Lions S.C. | 1986 | 1990 |
| Orlando Nighthawks | 1997 | 1999 |
| Orlando Sundogs | 1997 | 1997 |
| Oscar Mayer Co. | 1934 | 1936 |
| Oshkosh Sport Club | 1927 | 1964 |
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