STD Rates in Johnson County, Iowa
2023 CDC surveillance data for Johnson County, Iowa — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Johnson County has one of the higher STD burdens in Iowa, with a combined rate of 730.0 per 100,000 residents in 2023 — ranking 8th of 99 counties. Reported infections included chlamydia at 578.3 per 100,000 (911 cases, 35% above the state rate), gonorrhea at 137.1 per 100,000 (216 cases, 17% above the state rate), syphilis at 14.6 per 100,000 (23 cases, 42% above the state rate). Routine testing is the surest way to catch STDs early, since many produce no symptoms. Johnson County has confidential testing locations available.
STD Trends in Johnson County, 2000–2023
Reported cases per 100,000 residents each year, against the Iowa 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.
Source: CDC NCHHSTP AtlasPlus county surveillance, 2000–2023.
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Johnson County vs Iowa and the US
| Infection | Johnson County | Iowa | US | vs Iowa | vs US | Rank in Iowa |
|---|---|---|---|---|---|---|
| Chlamydia | 578.3911 cases | 426.8 | 490.7 | 35.5% above | 17.9% above | 6th of 99 |
| Gonorrhea | 137.1216 cases | 116.8 | 178.2 | 17.4% above | 23.1% below | 11th of 99 |
| Syphilis (P&S) | 14.623 cases | 10.3 | 15.8 | 41.7% above | 7.6% below | 11th of 99 |
Rates per 100,000 residents, 2023. Ranks run from the highest rate (1st) among Iowa’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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