How much do you have to weigh to sit in the front passenger seat in Washington State?

In Washington state, there is no specific weight requirement to sit in the front passenger seat. However, all passengers must use seat belts, and children under 13 years old are recommended to sit in the back seat for safety. Additionally, child safety seats must be used for younger children according to their weight and height. Always ensure that seat belts are properly fastened for all occupants, regardless of weight.