Signature distribution requirements for state ballot initiatives as a percentage of jurisdictions that signatures must be gathered from

The map is based on requirements for initiated constitutional amendments unless the state does not have initiated amendments; in those cases, the requirement for initiated state statutes or veto referendums is used.

Note: Mississippi has an initiated constitutional amendment process, including a signature distribution requirement based on five congressional districts. However, the requirements cannot be met, according to the Mississippi Supreme Court, because the state has four congressional districts following reapportionment in 2001.
Source: Ballotpedia