According to Trusting Teachers With School Success, by Kim Farris-Berg, Edward Dirkswager, and Amy Junge, there are approximately 150 teacher-led schools in the US.  Teacher-led schools are defined as schools in which teachers may have decision-making authority in areas such as determining the learning program and materials, setting the schedule, setting school-level policies (such as homework, grading policies), selecting, evaluating, and retaining colleagues, determining budget, etc.