STD Rates in Merrimack County, New Hampshire
2023 CDC surveillance data for Merrimack County, New Hampshire — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Merrimack County reported a combined STD rate of 218.9 per 100,000 residents in 2023, placing it 3rd of 10 New Hampshire counties — in the upper half of the state. Reported infections included chlamydia at 180.1 per 100,000 (283 cases, 8% below the state rate), gonorrhea at 33.1 per 100,000 (52 cases, 21% below the state rate), syphilis at 5.7 per 100,000 (9 cases, too few for a reliable comparison). Confidential STD testing is available throughout Merrimack County — knowing your status is the only way to catch infections that often show no symptoms.
STD Trends in Merrimack County, 2000–2023
Reported cases per 100,000 residents each year, against the New Hampshire 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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Merrimack County vs New Hampshire and the US
| Infection | Merrimack County | New Hampshire | US | vs New Hampshire | vs US | Rank in New Hampshire |
|---|---|---|---|---|---|---|
| Chlamydia | 180.1283 cases | 196.6 | 490.7 | 8.4% below | 63.3% below | 3rd of 10 |
| Gonorrhea | 33.152 cases | 41.9 | 178.2 | 21% below | 81.4% below | 3rd of 10 |
| Syphilis (P&S) | 5.79 cases | 3.9 | 15.8 | Too few cases | Too few cases | – |
Rates per 100,000 residents, 2023. Ranks run from the highest rate (1st) among New Hampshire’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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