American soccer writing, history & data.
| Club | From | To |
|---|---|---|
| O'Brien Live Wires | 1912 | 1913 |
| O'Learys | 1907 | 1912 |
| Oakland Clippers | 1967 | 1968 |
| Oakland Roots Sports Club | 2019 | None |
| Oklahoma City Slickers | 1982 | 1983 |
| Oklahoma City Spirit S.C. | 1990 | None |
| Oklahoma City Warriors | 1986 | 1993 |
| Olympia S.C. | 1965 | 1967 |
| Orlando Lions S.C. | 1986 | 1990 |
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