What the Data Shows

Over the 2015-2023 reporting window, South Dakota recorded 1,177 total road fatalities across 66 counties, with 140 deaths logged in 2023. The state's fatality rate stands at 15.2 per 100,000 residents and 1.4 per 100 million vehicle miles traveled, placing it at rank #14 of 51 US states when ordered from highest to lowest fatality rate. Against the national benchmark of 12.2 per 100K, South Dakota is 24.5% above average, a gap that matters for insurers, policymakers, and drivers calibrating risk.

Cause breakdowns from NHTSA FARS show alcohol-impaired crashes accounting for 33.4% of South Dakota's fatalities (393 deaths), speeding for 28.0% (329 deaths), and pedestrian incidents for 7.9% (93 deaths). The single largest contributing factor is unrestrained, involved in 648 of the state's road deaths. Because these categories overlap, a nighttime fatal crash may also involve alcohol and speeding, the percentages are not additive but do reveal where enforcement and infrastructure investment can most reduce future deaths.

The trend signal is equally important: South Dakota's annual fatality count is increasing, changing +4.5% across the reporting period. Annual deaths moved from 134 in 2015 to 140 in 2023. Rural roads account for 980 deaths versus 197 on urban roads, a pattern that typically reflects longer emergency-response distances and higher travel speeds outside metro areas. Readers should treat this as descriptive data, not a ranking of driver quality, and always cross-reference the underlying FARS release for year-specific context.