STD Rates in Wisconsin
CDC surveillance data for Wisconsin covering chlamydia, gonorrhea, syphilis, and HIV — with 15-year trends, city-level context, and national comparisons.
Wisconsin sits in the bottom third of states for STD burden, ranking 36th out of 50 on combined chlamydia, gonorrhea, and syphilis rates in 2023. That sounds reassuring — until you look at where the state has come from. All three diseases are substantially higher than they were 15 years ago, and one of them, syphilis, has increased more than 650% since 2008. Wisconsin isn't a hot spot on the national map, but the direction of travel has been consistently upward for the better part of two decades.
Chlamydia is Wisconsin's highest-volume disease by far — nearly 25,000 cases in 2023, at a rate of 422.8 per 100,000 people. That puts the state below the US median of 471.3, which looks like a win on paper. But the long-run picture is less tidy: chlamydia rates have risen about 13% since 2008, and after peaking near 500 per 100,000 in 2019, they've drifted down rather than dropped. The 2023 rate is only modestly better than where Wisconsin was in 2010. This isn't a resolved problem — it's a plateau at an elevated level.
Gonorrhea tells a more volatile story. The rate peaked at 177.3 per 100,000 in 2021 — well above the current US median of 152.2 — then fell sharply, landing at 118.5 in 2023, a 20% drop in a single year. That's the kind of decline worth noticing. Syphilis moved the same direction in 2023, falling nearly 28% year-over-year to 9.1 per 100,000. Both numbers are down from recent peaks, but syphilis in particular has come a long way from where it started: the rate was just 1.2 per 100,000 in 2008. Even after last year's drop, it's still more than seven times that baseline.
Wisconsin's HIV picture has moved in a different direction. New diagnoses climbed from 205 in 2018 to 291 in 2022 — a rate of 5.8 per 100,000, up from a recent low of 4.2. The 2020 numbers likely reflect pandemic-related gaps in testing rather than a real pause in transmission. For anyone in Milwaukee, Madison, or Green Bay — the state's three most populous cities and likely the centers of most of this activity — knowing your status starts with finding a testing location, and STDTest.com can show you what's available near you today.
STD Trends in Wisconsin
Wisconsin's chlamydia rate has been hovering in the 420–440 range for several years now, never quite climbing back to its 2019 peak of 499.4 but never returning to pre-2010 levels either. The 3% year-over-year dip in 2023 continues a soft downward trend, but the long-run rise of about 13% since 2008 means the state is operating at a structurally higher baseline than it was a generation ago. At 422.8 per 100,000, Wisconsin remains below the US median of 471.3 — but the gap is narrower than it used to be.
Gonorrhea in Wisconsin had one of its sharpest single-year declines on record in 2023, falling more than 20% to 118.5 per 100,000 after nearly a decade of increases. At its 2021 peak, the state's rate had more than doubled from its 2014 low of 70.9, briefly pushing above the current US median of 152.2. The 2023 rate now sits well below that median — but the long-run rise of roughly 9.5% since 2008 is a reminder that this disease has been trending upward in Wisconsin for most of the past 15 years, with last year's drop representing a reversal that's real but not yet proven durable.
Syphilis is where Wisconsin's data gets hardest to brush past. The rate has increased more than 650% since 2008 — from 1.2 per 100,000 to a peak of 12.6 in 2022 — before falling to 9.1 in 2023. That 28% year-over-year decline is the largest single-year drop in the state's recent syphilis history, and it pushes Wisconsin back below the US median of 14.8 for the first time in several years. Whether that represents a genuine turning point or a single-year fluctuation is something the next few years of data will have to answer.
Wisconsin's HIV data runs through 2022, and the trend over that period has been upward. New diagnoses rose from 205 in 2018 to 291 in 2022, pushing the rate from 4.2 to 5.8 per 100,000. The slight uptick in 2020 — just 215 cases — almost certainly reflects reduced testing access during the pandemic rather than a genuine slowdown in transmission; rates resumed climbing sharply the following year. The five-year trajectory is a consistent increase, not a plateau.
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Wisconsin vs National Average
Comparing 2023 rates against the U.S. median across all 50 states.
| Infection | Wisconsin | US Median | Difference |
|---|---|---|---|
| Chlamydia | 422.8 | 471.3 | 10.3% below |
| Gonorrhea | 118.5 | 152.2 | 22.1% below |
| Syphilis (P&S) | 9.1 | 14.8 | 38.5% below |
What the numbers mean — and what to do about them
Wisconsin's combined STD rate of 550.4 per 100,000 translates to roughly 32,500 chlamydia, gonorrhea, and syphilis diagnoses in 2023 alone — and that's only what gets counted. These numbers represent confirmed, reported cases, which means they're a floor, not a ceiling. Chlamydia in particular is widely understood to be underdiagnosed because most infections produce no symptoms. The state's below-median ranking offers some perspective, but it doesn't change what the raw numbers represent: tens of thousands of new infections in a single year.
The trend most worth paying attention to is syphilis. A rate that has risen more than 650% since 2008 — even after last year's decline — signals a disease that spread quietly for years before making it into the numbers. Gonorrhea followed a similar path: it nearly tripled from its 2014 low before pulling back sharply in 2023. Both diseases can be asymptomatic, which is how they travel. An infection you don't feel is one you can still transmit, and one that can cause long-term complications if it goes untreated. The year-over-year declines in 2023 are real, but they don't erase the structural increase of the past decade and a half.
If you live in Milwaukee, Madison, or Green Bay — or anywhere in Wisconsin — and you're sexually active, the data makes a straightforward case for knowing your status. Testing is quick, widely available, and the only way to know for certain. Wisconsin's syphilis rate rose more than sevenfold over 15 years while most people had no reason to think about it. STDTest.com can show you exactly where to get tested today.
WHO SHOULD GET TESTED
Anyone sexually active in Wisconsin should consider routine STD screening, but the state's data points to specific groups at elevated risk. Young adults under 25 account for the bulk of Wisconsin's nearly 25,000 annual chlamydia cases. Men who have sex with men have been disproportionately affected by syphilis as rates climbed steeply through the 2010s and early 2020s. And given Wisconsin's rising HIV diagnosis rate — up to 5.8 per 100,000 in 2022 — anyone with new or multiple partners should include HIV in their testing panel.
HOW OFTEN
Given that Wisconsin's chlamydia rate has held near 420–430 per 100,000 for several years and syphilis remains more than seven times its 2008 baseline, annual testing is a reasonable minimum for sexually active adults. If you have multiple partners or are in a higher-risk group, testing every three to six months — particularly for gonorrhea, syphilis, and HIV — reflects the state's actual risk environment more accurately than once-a-year screening does.
WHAT TO EXPECT
STD testing is typically fast and straightforward — most panels involve a urine sample, a blood draw, or a swab, and take under 30 minutes at most clinics. Results are usually available within a few days. Testing sites in Milwaukee, Madison, Green Bay, and across Wisconsin offer confidential services, and many allow online booking. If a result comes back positive, treatment for chlamydia, gonorrhea, and syphilis is highly effective when caught early.
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