Data Year: 2023Source: CDC STI SurveillancePopulation: 17,182
Combined
157.1
per 100K
49th / 64
Chlamydia
145.5
per 100K • 25 cases
Gonorrhea
5.8
per 100K • 1 cases
Syphilis P&S
5.8
per 100K • 1 cases
Union County is among the lower-burden counties in South Dakota, reporting a combined STD rate of 157.1 per 100,000 residents in 2023 — 49th of 64 counties. Reported infections included chlamydia at 145.5 per 100,000 (25 cases, 73% below the state rate), gonorrhea at 5.8 per 100,000 (1 case, 98% below the state rate), syphilis at 5.8 per 100,000 (1 case, 92% below the state rate). Many STDs show no symptoms, so testing is the only reliable way to know your status. Confidential options are available across Union County.
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Data sourced from the CDC's annual STI Surveillance Report. Rates are per 100,000 population and reflect reported cases only — actual prevalence is likely higher due to undiagnosed infections. While we strive for accuracy, STDTest.com makes no representations or warranties regarding the completeness or accuracy of this data and is not responsible for any errors or omissions. This page is for informational purposes only and does not constitute medical advice.