This depends on the regulations of your local organisers of hockey competition, but in most areas there are divisions or general leagues that allow mixed-sex teams. Some restrict or require certain numbers of each sex to be on the field at a time, e.g. no more than four males or at least four females. These are especially likely in places where a school has entered a team and either does not have enough players for one side, or does not want to separate the two sexes.
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In cases of Coed teams, teams that boys and girls can both play on, yes. Coed teams are more common in younger kids, as they get older there are less. Sometimes you will see a boys high school team that has some girls on it if the school doesn't have enough interest to field a whole team.