Summary List Placement1. At one year old, Clubhouse has a user base bigger than the population of Pennsylvania. Clubhouse has crossed 15 million app installs, according to the app analytics company SensorTower. Its founders also said Tuesday that the app had 15 million users. If it was a state, Clubhouse would be the fifth largest state by population size, following California, Texas, Florida, and New York. 2. The company is only 35 employees.