STD Rates in Cass County, Michigan

2023 CDC surveillance data for Cass County, Michigan — chlamydia, gonorrhea, and syphilis rates with state comparisons.

Data Year: 2023 Source: CDC STI Surveillance Population: 51,645
Combined
358.2
per 100K
19th / 83
Chlamydia
304
per 100K • 157 cases
US rate: 490.7
17th of 83 in Michigan
Higher than 54% of US counties
Gonorrhea
52.3
per 100K • 27 cases
US rate: 178.2
26th of 83 in Michigan
Higher than 42% of US counties
Syphilis P&S
1.9
per 100K • 1 cases
Based on 1 case — interpret with care
US rate: 15.8

Cass County has one of the higher STD burdens in Michigan, with a combined rate of 358.2 per 100,000 residents in 2023 — ranking 19th of 83 counties. Reported infections included chlamydia at 304.0 per 100,000 (157 cases, 29% below the state rate), gonorrhea at 52.3 per 100,000 (27 cases, 66% below the state rate), syphilis at 1.9 per 100,000 (1 case, 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 Cass County.

STD Trends in Cass County, 2000–2023

Reported cases per 100,000 residents each year, against the Michigan 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
304.0
per 100K in 2023
144.8 in 2000
Peak 415.2 in 2019
Gonorrhea
52.3
per 100K in 2023
29.4 in 2000
Peak 163.4 in 2022
Syphilis (P&S)
1.9
per 100K in 2023
0.0 in 2000
Peak 3.9 in 2020

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

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Cass County vs Michigan and the US

Infection Cass County Michigan US vs Michigan vs US Rank in Michigan
Chlamydia 304157 cases 429.5 490.7 29.2% below 38% below 17th of 83
Gonorrhea 52.327 cases 152.2 178.2 65.6% below 70.7% below 26th of 83
Syphilis (P&S) 1.91 case 8.4 15.8 Too few cases Too few cases –

Rates per 100,000 residents, 2023. Ranks run from the highest rate (1st) among Michigan’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

Cass County ranks 19th of 83 Michigan counties for combined STD rate in 2023, at 358.2 per 100,000 residents.
In 2023, chlamydia was the most frequently reported STD in Cass County, with 157 cases at a rate of 304.0 per 100,000 residents.
STDTest.com lists confidential testing locations across Cass County and Michigan. 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.