What State Has the Highest STD Rate? (Ranked)
Southern states dominate CDC STI rankings — Mississippi, Louisiana, Alaska, South Carolina and Arkansas consistently top per-capita rates for chlamydia and gonorrhea, while Nevada, California, Texas and Georgia rank high for syphilis. Rates reflect healthcare access, funding and surveillance intensity more than behavior alone. The 2023 data shows chlamydia leading everywhere, with syphilis climbing fastest nationwide.
The state rankings (2023 CDC data)
Based on CDC's Sexually Transmitted Infections Surveillance report — cases per 100,000 population:
| Rank | Chlamydia leaders | Gonorrhea leaders |
|---|---|---|
| 1 | Mississippi | Mississippi |
| 2 | Louisiana | Alaska |
| 3 | Alaska | South Carolina |
| 4 | South Carolina | Louisiana |
| 5 | Alabama / Arkansas | Oklahoma / Arkansas |
For primary & secondary syphilis, the leaderboard shifts westward: Nevada, California, Texas and New Mexico join southern states at the top. Congenital syphilis clusters hardest in Texas, California, Arizona and Florida by raw case counts.
Cities worth noting: Memphis, Jackson (MS), Baltimore and St. Louis perennially top metro-level rankings — big-city prevalence plus underfunded public health infrastructure.
Why the South dominates (it's not behavior)
Epidemiologists attribute regional concentration to structural factors:
- Healthcare access gaps: more uninsured residents, fewer providers per capita, longer distances to clinics.
- Funding disparities: STI program budgets vary enormously by state.
- Rural clinic deserts: screening requires somewhere to go.
- Social determinants: poverty correlates with every infectious disease metric through access, housing and education pathways.
- Surveillance effects: better-funded states sometimes find MORE cases simply by testing more — a paradox that complicates naive ranking reads.
The practical translation: geography predicts risk exposure environment, not personal inevitability — and it argues harder for routine testing in high-rate regions, not stigma.
Using this information well
- If you live in or moved from a high-rate state, baseline testing carries extra justification — community prevalence sets your prior risk.
- Travel/college moves: new regions mean new exposure pools; test on arrival patterns change (frequency guide).
- Local resources vary too: high-burden states often run strong free public-clinic networks precisely because demand is high (free options, venue comparison).
- National numbers for context: our STD statistics roundup covers the country-wide picture.
Frequently asked questions
Sources & further reading
- 📚 CDC — STI Surveillance 2023 (state tables) — www.cdc.gov/std/statistics
- 📚 CDC — NCHHSTP AtlasPlus interactive maps — www.cdc.gov/nchhstp/atlas