How many states are there in Qin Dynasty?

At the begining of the Qin Dynasty, there were seven big states, including Qin, Chu, Qi, Zhao, Yan, Han, and Wei, and several smaller states such as Lu, Zheng, Guo, Yu, Zhongshan, Wei, and Cai. Then in the ten years from 230 to 221 BC, Qin Shi Huang unified the seven big states as a whole Qin State.

During the late Warring States Period (476 BC - 221 BC), the state of Qin was in its full development. When Yingzheng was in his reign, he defeated the other six states (Han, Zhao, Wei, Yan, Chu and Qi), from 230 BC to 221 BC. So ending the chaos caused by wars among vassals that had lasted over 500 years. He established a unified and centralized country and declared Xianyang, in Shaanxi Province, the capital city of the Qin.

there are 6 states (Found on different website)