STD Rates in Lyman County, South Dakota

2023 CDC surveillance data for Lyman County, South Dakota — chlamydia, gonorrhea, and syphilis rates with state comparisons.

Data Year: 2023 Source: CDC STI Surveillance Population: 3,705
Combined
2132.2
per 100K
10th / 64
Chlamydia
1214.6
per 100K • 45 cases
US rate: 490.7
9th of 64 in South Dakota
Higher than 98% of US counties
Gonorrhea
728.7
per 100K • 27 cases
US rate: 178.2
7th of 64 in South Dakota
Higher than 99% of US counties
Syphilis P&S
188.9
per 100K • 7 cases
Based on 7 cases — interpret with care
US rate: 15.8

Lyman County has one of the higher STD burdens in South Dakota, with a combined rate of 2,132.2 per 100,000 residents in 2023 — ranking 10th of 64 counties. Reported infections included chlamydia at 1214.6 per 100,000 (45 cases, 128% above the state rate), gonorrhea at 728.7 per 100,000 (27 cases, 188% above the state rate), syphilis at 188.9 per 100,000 (7 cases, too few for a reliable comparison). Many STDs show no symptoms, so testing is the only reliable way to know your status. Confidential options are available across Lyman County.

STD Trends in Lyman County, 2000–2023

Reported cases per 100,000 residents each year, against the South Dakota rate (dashed). In a county this size a handful of cases moves the rate a long way, so read the shape rather than any single year.

Chlamydia
1,214.6
per 100K in 2023
282.1 in 2000
Peak 1,273.0 in 2022
Gonorrhea
728.7
per 100K in 2023
0.0 in 2000
Peak 1,354.3 in 2022
Syphilis (P&S)
188.9
per 100K in 2023
0.0 in 2000
Peak 270.9 in 2022

Source: CDC NCHHSTP AtlasPlus county surveillance, 2000–2023.

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Lyman County vs South Dakota and the US

Infection Lyman County South Dakota US vs South Dakota vs US Rank in South Dakota
Chlamydia 1214.645 cases 531.6 490.7 128.5% above 147.5% above 9th of 64
Gonorrhea 728.727 cases 253.3 178.2 187.7% above 308.9% above 7th of 64
Syphilis (P&S) 188.97 cases 73.4 15.8 Too few cases Too few cases –

Rates per 100,000 residents, 2023. Ranks run from the highest rate (1st) among South Dakota’s counties. The US rate is all 50 states combined. Comparisons are left out where fewer than 20 cases were reported, because a rate built on so few cases can swing widely from one year to the next.

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FAQs

Lyman County ranks 10th of 64 South Dakota counties for combined STD rate in 2023, at 2,132.2 per 100,000 residents.
In 2023, chlamydia was the most frequently reported STD in Lyman County, with 45 cases at a rate of 1214.6 per 100,000 residents.
STDTest.com lists confidential testing locations across Lyman County and South Dakota. Many offer same-day appointments with results in 1–3 days.
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.