The Federal Trade Commission is rolling out a national “Do Not Call” registry this year. They will be taking online registration requests this summer, phasing in regions starting in June to better deal with anticipated demand. Many states already have unsolicited phone call legislation, and some have their own online registration sites. Some charge a fee, some don’t. Others refer you to the DMA registration page. Here’s a list of states with online registration:

Alabama
Arkansas
California (prereg for FTC list)
Colorado
Connecticut
Georgia
Idaho
Indiana
Kansas
Kentucky
Louisiana
Maine (sends info to DMA)
Massachusetts
Minnesota
Missouri
New York
Oklahoma
Oregon
Pennsylvania
Tennessee
Texas
Utah (coming soon)
Wisconsin

(You are welcome to note that I wasted some amount of time compiling a list that may be obsolete when the national registry goes online. Consider it a recognition of the work of the many web programmers who keep our government sites operational.)