According to multiple sources, including Forbes, Travel Channel, and House Beautiful, Texas is the state with the most haunted houses in the United States. Other states that are frequently mentioned as being haunted include California, Ohio, Michigan, Illinois, and West Virginia. However, it is important to note that the number of haunted houses in each state is difficult to quantify and varies depending on the source. Additionally, the definition of a "haunted house" can vary widely, from a private residence with a history of paranormal activity to a public attraction designed to scare visitors.