For initiatives filed prior to the Municipal Primary Election in May 2022, 39,442 valid signatures of registered Portland voters are required on a petition to qualify to the ballot. This includes petitions intended for the regular primary and general elections held in May 2022 and November 2022.  

City Code Section 2.04.090 says that an initiative petition shall be signed by a number of legal voters equal to or greater than 9 percent of the number of electors registered in the city on the date of the primary municipal election immediately preceding the date the prospective petition is filed. On the date of the May 19, 2020 Primary Election, there were 438,238 registered voters in the City of Portland.