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Glenn County Sheriffx27s Posse Welcome Welcome to the home of GCSP the Glenn County Sheriffs Posse. Were glad you found us. Glenn County Sheriffx27s Posse Established in 1955 the Glenn County Sheriffs Posse is the premier equestrian facility and horsemanship group in beautiful Glenn County California. Our beautiful facility offers something for every equine discipline and the club supports and promotes all levels of horsemanship throughout the tricounty area.