STD Rates in Mercer County, New Jersey
2023 CDC surveillance data for Mercer County, New Jersey — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Mercer County has one of the higher STD burdens in New Jersey, with a combined rate of 655.0 per 100,000 residents in 2023 — ranking 5th of 21 counties. Reported infections included chlamydia at 505.4 per 100,000 (1,929 cases, 32% above the state rate), gonorrhea at 139.4 per 100,000 (532 cases, 28% above the state rate), syphilis at 10.2 per 100,000 (39 cases, 26% above the state rate). Routine testing is the surest way to catch STDs early, since many produce no symptoms. Mercer County has confidential testing locations available.
STD Trends in Mercer County, 2000–2023
Reported cases per 100,000 residents each year, against the New Jersey 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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Mercer County vs New Jersey and the US
| Infection | Mercer County | New Jersey | US | vs New Jersey | vs US | Rank in New Jersey |
|---|---|---|---|---|---|---|
| Chlamydia | 505.41,929 cases | 384.1 | 490.7 | 31.6% above | 3% above | 4th of 21 |
| Gonorrhea | 139.4532 cases | 109.1 | 178.2 | 27.8% above | 21.8% below | 7th of 21 |
| Syphilis (P&S) | 10.239 cases | 8.1 | 15.8 | 25.9% above | 35.4% below | 7th of 21 |
Rates per 100,000 residents, 2023. Ranks run from the highest rate (1st) among New Jersey’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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