STD Rates in Nevada County, California

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

Data Year: 2023 Source: CDC STI Surveillance Population: 102,053
Combined
251.8
per 100K
48th / 58
Chlamydia
170.5
per 100K • 174 cases
US rate: 490.7
49th of 58 in California
Higher than 20% of US counties
Gonorrhea
71.5
per 100K • 73 cases
US rate: 178.2
36th of 58 in California
Higher than 54% of US counties
Syphilis P&S
9.8
per 100K • 10 cases
Based on 10 cases — interpret with care
US rate: 15.8

Nevada County is among the lower-burden counties in California, reporting a combined STD rate of 251.8 per 100,000 residents in 2023 — 48th of 58 counties. Reported infections included chlamydia at 170.5 per 100,000 (174 cases, 65% below the state rate), gonorrhea at 71.5 per 100,000 (73 cases, 62% below the state rate), syphilis at 9.8 per 100,000 (10 cases, too few for a reliable comparison). Confidential STD testing is available throughout Nevada County — knowing your status is the only way to catch infections that often show no symptoms.

STD Trends in Nevada County, 2000–2023

Reported cases per 100,000 residents each year, against the California 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.

Chlamydia
170.5
per 100K in 2023
0.0 in 2000
Peak 254.8 in 2016
Gonorrhea
71.5
per 100K in 2023
0.0 in 2000
Peak 72.5 in 2021
Syphilis (P&S)
9.8
per 100K in 2023
1.1 in 2000
Peak 11.0 in 2019

Source: CDC NCHHSTP AtlasPlus county surveillance, 2000–2023.

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Nevada County vs California and the US

Infection Nevada County California US vs California vs US Rank in California
Chlamydia 170.5174 cases 491.1 490.7 65.3% below 65.3% below 49th of 58
Gonorrhea 71.573 cases 190.2 178.2 62.4% below 59.9% below 36th of 58
Syphilis (P&S) 9.810 cases 16.3 15.8 Too few cases Too few cases –

Rates per 100,000 residents, 2023. Ranks run from the highest rate (1st) among California’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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FAQs

Nevada County ranks 48th of 58 California counties for combined STD rate in 2023, at 251.8 per 100,000 residents.
In 2023, chlamydia was the most frequently reported STD in Nevada County, with 174 cases at a rate of 170.5 per 100,000 residents.
STDTest.com lists confidential testing locations across Nevada County and California. 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.