Douglas County urges voters to check registration before June primary ballot mailing

Douglas County voters have only a short window to make sure their registration is right before primary ballots start going out on June 8. County elections officials are pushing residents to confirm their address, check their status, and know where to return a ballot so a simple paperwork problem does not cost them a vote.

The June 30, 2026 Primary Election will run from 7:00 a.m. to 7:00 p.m., and ballots must be received by 7:00 p.m. that day. Postmarks do not count. If a ballot has not arrived by June 17, voters can request a replacement from Douglas County Elections at 125 Stephanie Place in Castle Rock or by calling 303-660-7444.

The timing matters in a county where people move often between Castle Rock, Parker, Lone Tree, Highlands Ranch, Castle Pines and unincorporated neighborhoods. An address change can send a ballot to the wrong place, alter precinct information, or leave a voter with an outdated mailing record. Douglas County says every voter receives a mail ballot sent to the mailing address on file, so anyone who has moved, changed units, or switched mailing addresses needs to correct the record now.

County officials are also warning voters not to wait until the last minute to decide how they will return a ballot. Douglas County says its 24-hour ballot drop boxes open June 8 and stay open until 7:00 p.m. on Election Day. There will be 23 ballot drop box locations across the county, and each one is under 24-hour video surveillance. Four Voter Service and Polling Centers will also be open for in-person voter services.

Colorado Secretary of State Jena Griswold certified the state primary ballot on May 1. Voters affiliated with the Democratic, Republican, Libertarian or Unity parties by June 8 will receive only the ballot for their party affiliation. Unaffiliated voters will receive Democratic and Republican primary ballots and may request a Unity ballot from their county clerk.

Douglas County says it contacts voters before each election when records show a temporary ballot address, ID-required status, or inactivity so those problems can be fixed before ballots are mailed. That list-checking is part of the county’s broader election-security pitch, with Colorado’s statewide voter registration database serving as the single source for voter names and addresses in mail-ballot elections.