Gann Valley voters are served by the Buffalo County Auditor, who functions as Buffalo County's chief election official and voter registration administrator. The Auditor's office, located at 419 2nd Street SW, Gann Valley, SD 57341, can be reached at (605) 293-3234. This office maintains voter rolls, conducts elections, certifies results, and assists residents with absentee ballots and polling place information throughout Buffalo County.
South Dakota residents can register to vote online at sdsos.gov/elections-voting/voting/register-to-vote.aspx through the Secretary of State's website, or submit a paper application to the Buffalo County Auditor. Registration requirements include U.S. Citizenship, being at least 18 years old by the next election, South Dakota residency, and not currently serving a felony sentence. Voters must present photo identification at the polls - acceptable forms include a South Dakota driver's license, state-issued ID card, passport, military ID, tribal ID, or student ID from a South Dakota high school or college. Registration must be completed at least 15 days before any election. The state does not allow online party affiliation changes during the 15 days preceding a primary election. As an unincorporated community without municipal government, Gann Valley holds no mayoral or city council elections. Residents participate in county, state, and federal contests only. Buffalo County voters elect commissioners, sheriff, auditor, treasurer, register of deeds, state's attorney, and coroner in county races. Commission seats operate on staggered terms, with some contested in presidential years and others during midterms. Residents can locate their assigned polling place by contacting the Buffalo County Auditor at (605) 293-3234 or using the polling place lookup tool at sdsos.gov/elections-voting/voting/polling-place-information.aspx. Given Buffalo County's small population and vast geography, only a handful of polling locations serve the entire area, often including a site in or near the community at the courthouse or a similar public building. South Dakota election records available to the public include voter registration lists (purchasable for political purposes under SDCL 12-4-48), campaign finance reports filed by candidates and political committees (searchable at sdsos.gov/elections-voting/campaign-finance), candidate filings and organizational statements, precinct-level election results, and absentee ballot statistics. Individual voter history, showing which elections someone participated in, though not their choices, is also public record. Actual ballots remain secret. In the November 2024 presidential election, Buffalo County recorded turnout of approximately 70-75% of registered voters, matching South Dakota's traditionally strong participation rates, especially in rural counties. County voters, like most across the state, supported Republican candidates by wide margins in federal and state contests. Total votes cast numbered approximately 1,100-1,200 out of roughly 1,500-1,600 registered voters. Looking ahead to the November 3, 2026 general election, voters in the area will decide several significant races. South Dakota will hold elections for Governor (current Governor Kristi Noem's term expires in 2027, placing the gubernatorial race on the 2026 ballot), one U.S. House seat (the state's single at-large congressional district), all state legislative seats in both chambers (Senate and House districts operate on staggered terms, with 2026 bringing elections for expiring seats), and various county offices including potentially commissioners, sheriff, auditor, and other constitutional officers whose terms end that year. Specific local ballot measures or bond issues may also appear depending on county commission or school board actions. Candidate filing opens in early 2026, with the primary scheduled for June 2026 and the general election on November 3, 2026. South Dakota offers no-excuse absentee voting, allowing any registered voter to request an absentee ballot without stating a reason. Applications can be submitted to the Buffalo County Auditor by mail, email, fax, or online through the Secretary of State's portal at sdsos.gov/elections-voting/voting/absentee-voting.aspx. Requests must arrive by 5:00 PM the day before the election (or the preceding Friday for Tuesday elections). Completed absentee ballots must reach the Buffalo County Auditor by 7:00 PM on Election Day to count. The state does not conduct universal mail-in voting; absentee ballots require specific requests. Early in-person voting (also called in-person absentee voting) begins 46 days before an election at the Buffalo County Auditor's office, allowing voters to cast ballots during regular office hours before Election Day.