Custer County, South Dakota auditor's office: address and phone for 2026
The South Dakota Secretary of State lists the Custer County Auditor at 420 Mt. Rushmore Rd., Custer, SD 57730, phone 605-673-8173. In-person early voting is at this office: it opens Friday, September 18. Call for its hours.
Custer County auditor's office
Check your registration and find your polling place at the Secretary of State's Voter Information Portal, the state's voter site.
South Dakota voting dates for Custer County voters
| Date | What |
|---|---|
| Fri, Sep 18, 8:00 AM | Absentee voting opens Absentee voting for the Nov 3 election begins Sept 18. Check your county auditor's hours. source |
| Mon, Oct 19, 5:00 PM | Last day to register Voter registration closes at 5 p.m. local time. source |
| Mon, Nov 2, 5:00 PM | Request an absentee ballot Your request must reach your county auditor before 5 p.m. local time the day before the election. source |
| Tue, Nov 3, 7:00 PM | Last day to return your absentee ballot It must be received by 7:00 p.m. source |
| Tue, Nov 3, 7:00 PM | Election Day: polls open 7:00 a.m. to 7:00 p.m. Local time. Eastern South Dakota is on Central Time; western South Dakota is on Mountain Time. source |
Custer County voting questions
What is the phone number for the Custer County auditor's office?
605-673-8173, the Auditor (Custer County's auditor's office on the South Dakota Secretary of State, County Auditors list).
What is the address of the Custer County auditor's office?
420 Mt. Rushmore Rd., Custer, SD 57730.
When does early voting start in Custer County?
Absentee voting opens Friday, September 18, 2026. Absentee voting for the Nov 3 election begins Sept 18. Check your county auditor's hours.
More for South Dakota voters
- Who is on the South Dakota ballot: every candidate on the state's official list, race by race.
- South Dakota voting deadlines 2026: registration, mail ballots, early voting and Election Day.
- Every South Dakota county's office.
- Early voting dates in every state.
Other South Dakota counties: Aurora, Beadle, Bennett, Bon Homme, Brookings, Brown, Brule, Buffalo, Butte, Campbell, Charles Mix, Clark, Clay, Codington, Corson, Davison, Day, Deuel, Dewey, Douglas, Edmunds, Fall River, Faulk, Grant, Gregory, Haakon, Hamlin, Hand, Hanson, Harding, Hughes, Hutchinson, Hyde, Jackson, Jerauld, Jones, Kingsbury, Lake, Lawrence, Lincoln, Lyman, Marshall, McCook, McPherson, Meade, Mellette, Miner, Minnehaha, Moody, Oglala Lakota, Pennington, Perkins, Potter, Roberts, Sanborn, Spink, Stanley, Sully, Todd, Tripp, Turner, Union, Walworth, Yankton, Ziebach.
Office details are from the South Dakota Secretary of State, County Auditors (checked October 14, 2026). Dates are South Dakota's, each linked to its source. Call the office before you go.