The United Inventors Association is a US nationally-oriented group that many local inventors' clubs have joined.

Inventors' Digest index of local inventors' groups in the US  -- a good resource

Florida

• Tampa Bay area
• South West Florida -- Edison Inventors' Assn.  941-275-4332
• Central Florida -- Inventors' Council of Central Florida  407 438-3922
• Northeast Florida -- Space Coast Inventors' Guild 407-773-4031
• South East Florida -- Inventors' Society of South Florida -- PO Box 4306, Boynton Beach FL 33424-4306

Nevada:
1) Southern 953 E. Sahara Avenue, Suite 9B, Las Vegas, NV 89104
     Phone: (702) 435-7741. [email protected]
2) Northern: Nevada Inventors' Association
 

Ohio -- Inventor's Connection of Greater Cleveland

Tennessee Inventors' Association