Data Year: 2023Source: CDC STI SurveillancePopulation: 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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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.