This website has a list of investigation groups all over the United States. I will warn you though, not all groups listed here are still active. You would just have to call them or click on the website link. Not all website links work. Which usually means they are not investigating anymore.
The society affords investigative groups, scientists, researchers, ghost hunters, and the general public a place to go to ask questions, share knowledge, and learn from each other. In this field, true breakthroughs will happen because we are sharing results, refining techniques, and pushing each other to maintain a high level of integrity and quality of work.
It is like a Facebook for ghost hunters. Articles are great. Evidence posted by other groups. Has arcade games. The people are actually really friendly there. When you join and ask how you heard about it. Put 417 Paranormal Research Group or Heather -417PRG founder
The site owner, Wes Forsythe, is the host of the paranormal radio show Paranormal Filler. This site is his paranormal team's site. This also is the site for the archive shows of his radio show Paranormal Filler.