Where to vote in O'Fallon, Missouri on November 3, 2026
- Election DayTue, Nov 3Tuesday, November 3
- Polls open6 a.m. – 7 p.m.Local time
- Election officeSt. Charles County636-949-7550
Find your polling place Election office Voting dates
O'Fallon is in St. Charles County. O'Fallon has about 96,101 people, by the U.S. Census Bureau's 2025 estimate, which also gives its county lines.
St. Charles County local election authority
St. Charles County Clerk
Office: 397 Turner Blvd, St. Peters, MO 63376
Phone: 636-949-7550
Website: sccmo.org/410/Election-Authority
Check your registration and find your polling place at the Secretary of State's voter lookup, the state's voter site.
Missouri voting dates for O'Fallon voters
| Date | What |
|---|---|
| Wed, Oct 7, 5 p.m. Ended | Last day to register online, by mail or in person source |
| Tue, Oct 20 | No-excuse early voting opens source |
| Wed, Oct 21, 5 p.m. | Request an absentee ballot by mail source |
| Mon, Nov 2, 5 p.m. | Early voting ends source |
| Tue, Nov 3, 7 p.m. | Return your absentee ballot source |
| Tue, Nov 3, 7 p.m. | Election Day: polls open 6 a.m. to 7 p.m. source |
O'Fallon voting questions
Where do I vote in O'Fallon on Election Day?
At your assigned polling place, or a vote center where St. Charles County uses them. Polls are open 6 a.m. to 7 p.m. local time. Enter your address on the Missouri page to find yours.
What is the phone number of the election office for O'Fallon?
636-949-7550, the St. Charles County Clerk, 397 Turner Blvd, St. Peters, MO 63376.
Which county runs elections in O'Fallon?
St. Charles County. O'Fallon voters register and vote with St. Charles County.
More for O'Fallon voters
- Missouri voting deadlines 2026: registration, mail ballots, early voting and Election Day.
- St. Charles County election office: address and phone.
- Who is on the Missouri ballot, race by race.
- What's on my ballot and where do I vote, from your street address.
- Voting in every major U.S. city.
Other big cities in Missouri: Kansas City, St. Louis, Springfield, Columbia, Independence, Lee's Summit.
Office details are from the Missouri Secretary of State, Local Election Authorities (checked October 14, 2026). Dates are Missouri's, each linked to its source. Call the office before you go; city population and county lines are from the U.S. Census Bureau.