RIVERSIDE (CNS) - Nearly 450,000 mail-in ballots have been returned to the Riverside County Registrar of Voters office as of Thursday, Oct. 29, just over one-third of the total sent out countywide for Tuesday's general election. A total 1,243,154 mail-in ballots have been distributed, intended for every one of the county's registered voters. Compared to four years ago, the registration roll has increased 22%, according to the registrar's office. In October 2016, there were 1,022,375 registered voters in the county. Registrar Rebecca Spencer told City News Service last week that ballot returns in the current election cycle were nearly twice what the office processed during the same period in the 2016 presidential election cycle.