The following states are known to have a voter initiative process whereby citizens may initiate and ratify amendments to their state constitutions without the legislature. Please confirm and provide any states that may have been omitted. Those states with links have links to information on how to get initiatives on the ballot of that state.
Alaska
Arizona
Arkansas
California
Colorado
Florida
Idaho
Illinois
Maine
Massachusetts
Michigan
Mississippi
Montana
Nebraska
Nevada
North
Dakota
Ohio
Oklahoma
Oregon
South Dakota
Utah
Washington
Wyoming