STD Rates in Mercer County, New Jersey

2023 CDC surveillance data for Mercer County, New Jersey — chlamydia, gonorrhea, and syphilis rates with state comparisons.

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Data Year: 2023 Source: CDC STI Surveillance Population: 381,678
Combined
655
per 100K
5th / 21
Chlamydia
505.4
per 100K • 1,929 cases
Gonorrhea
139.4
per 100K • 532 cases
Syphilis P&S
10.2
per 100K • 39 cases

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.

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Mercer County vs New Jersey Average

Infection Mercer County New Jersey Rate Difference
Chlamydia 505.4 384.1 32% above
Gonorrhea 139.4 109.1 28% above
Syphilis (P&S) 10.2 8.1 26% above

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Largest cities in Mercer County, New Jersey

Largest first, by Census population. Each city page lists nearby clinics, free and low-cost testing, and labs.

STD testing in Trenton, NJ90,338 people → STD testing in Princeton, NJ30,756 people → STD testing in Mercerville, NJ13,535 people → STD testing in Hamilton Square, NJ11,622 people → STD testing in White Horse, NJ10,507 people → STD testing in Hamilton, NJ → STD testing in Ewing, NJ →

Largest Counties in New Jersey

Bergen County → Middlesex County → Essex County → Hudson County → Ocean County → Monmouth County → Union County → Camden County → Morris County → Passaic County →

All 21 New Jersey counties → STD testing in New Jersey →

FAQs

Mercer County ranks 5th of 21 New Jersey counties for combined STD rate in 2023, at 655.0 per 100,000 residents.
In 2023, chlamydia was the most frequently reported STD in Mercer County, with 1,929 cases at a rate of 505.4 per 100,000 residents.
STDTest.com lists confidential testing locations across Mercer County and New Jersey. Many offer same-day appointments with results in 1–3 days.

Related Resources

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Data sourced from the CDC's annual STI Surveillance Report. Rates are per 100,000 population and reflect reported cases only — actual prevalence is likely higher due to undiagnosed infections. While we strive for accuracy, STDTest.com makes no representations or warranties regarding the completeness or accuracy of this data and is not responsible for any errors or omissions. This page is for informational purposes only and does not constitute medical advice.
Sources