This is a randomized trial. Participants will be randomly assigned to 1 of 3 treatment arms: (1) Shape Up Rhode Island (a community-based weight loss campaign) plus and Internet-based behavioral weight loss program (SURI+IBWL), (2) SURI + IBWL + optional group sessions (SURI+IBWL+Group), or (3) SURI+IBWL + monetary incentives for submitting self-monitoring information and achieving clinically significant weight loss. The primary outcome is weight loss at 12 weeks.