= A deadline that has passed. Some states have more than one deadline, with differing deadlines depending on the type of ballot measure or because there are multiple stages in the petition submission process.
- ↑ Veto referendums, in most states, require a deadline of a certain amount of days after a targeted law is passed. Therefore, the deadlines in this chart do not apply to veto referendums. Deadlines can be found in a proposed veto referendum's article on Ballotpedia.
- ↑ Ohio uses both direct and indirect initiated statues. For the Legislature to consider an indirect statute, 115,574 signatures is needed, which equals to three percent of the total number of ballots casted in the 2010 Governor's election. If the Legislature fails to qualify the statute, a sponsor must collect an additional 115,574 signatures.