St. Charles County voters who like to beat the Election Day rush can start casting in-person absentee ballots on Tuesday, June 23, ahead of the Aug. 4 primary. County election officials have been posting reminders on social channels and the county website, urging residents to plan their early-voting strategy before the crowds show up.
County outlines early-voting rules
According to the St. Charles County Election Authority Absentee Voting page, "Absentee voting opens six weeks before Election Day." The page also notes that no-excuse in-person voting opens two weeks before Election Day and that absentee-by-mail applications must be received by 5 p.m. on the second Wednesday before the election. Those rules mean voters who want to cast ballots early in person can go to county offices starting June 23 for the Aug. 4 primary.
Key dates to remember
The Missouri Secretary of State's 2026 election calendar lists Aug. 4 as the Primary Election and July 8 as the voter-registration deadline. As a result, the six-week window places the start of in-person absentee voting on June 23 and the two-week no-excuse window beginning around July 21. The Missouri Secretary of State has the official election dates and filing timeline for the August primary.
Where to go and what to bring
The St. Charles County Election Authority office is at 397 Turner Blvd., St. Peters, and maintains weekday hours, with accessible curbside voting available for those who need it. Voters must bring a valid photo ID and can preview sample ballots with the county's lookup tool. For maps, hours and contact information, see the Election Authority page: St. Charles County Election Authority.
If you prefer mailed absentee ballots, file your application by the second Wednesday before the election (typically July 22) and ensure mailed ballots are returned and received by 7 p.m. on Election Day. You can track mailed ballots with the county's ballot tracker at St. Charles County ballot tracker or call the Election Authority at 636-949-7550 for questions.
