STD Rates in Middlesex County, Massachusetts

2023 CDC surveillance data for Middlesex County, Massachusetts — chlamydia, gonorrhea, and syphilis rates with state comparisons.

Data Year: 2023 Source: CDC STI Surveillance Population: 1,624,055
Combined
440.2
per 100K
7th / 14
Chlamydia
317.6
per 100K • 5,158 cases
Gonorrhea
114
per 100K • 1,852 cases
Syphilis P&S
8.6
per 100K • 139 cases

Middlesex County reported a combined STD rate of 440.2 per 100,000 residents in 2023, placing it 7th of 14 Massachusetts counties — in the upper half of the state. Reported infections included chlamydia at 317.6 per 100,000 (5,158 cases, 23% below the state rate), gonorrhea at 114.0 per 100,000 (1,852 cases, 18% below the state rate), syphilis at 8.6 per 100,000 (139 cases, 19% below the state rate). Many STDs show no symptoms, so testing is the only reliable way to know your status. Confidential options are available across Middlesex County.

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Middlesex County vs Massachusetts Average

Infection Middlesex County Massachusetts Rate Difference
Chlamydia 317.6 412.7 23% below
Gonorrhea 114 139.8 18% below
Syphilis (P&S) 8.6 10.6 19% below

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FAQs

Middlesex County ranks 7th of 14 Massachusetts counties for combined STD rate in 2023, at 440.2 per 100,000 residents.
In 2023, chlamydia was the most frequently reported STD in Middlesex County, with 5,158 cases at a rate of 317.6 per 100,000 residents.
STDTest.com lists confidential testing locations across Middlesex County and Massachusetts. Many offer same-day appointments with results in 1–3 days.
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.