The US has produced more documented serial killers than any other country, but some states have been linked to far more murderers than others. A chilling map reveals the number associated with every state, with California recording more serial killers than anywhere else in the country. Washington places eighth with 33 known serial killers, while Oregon and Indiana round out the top ten with 32 and 30, respectively. New Mexico ranks eighth with 12 documented serial killers, followed by Oklahoma with 23 and Nevada with 17. Dennis Rader, the self-proclaimed BTK Killer, murdered 10 people in and around Wichita, Kansas, between 1974 and 1991.