STD Rates in Placer County, California

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

Data Year: 2023 Source: CDC STI Surveillance Population: 423,583
Combined
250
per 100K
49th / 58
Chlamydia
197.6
per 100K • 837 cases
US rate: 490.7
48th of 58 in California
Higher than 28% of US counties
Gonorrhea
48.4
per 100K • 205 cases
US rate: 178.2
47th of 58 in California
Higher than 40% of US counties
Syphilis P&S
4
per 100K • 17 cases
Based on 17 cases — interpret with care
US rate: 15.8

Placer County is among the lower-burden counties in California, reporting a combined STD rate of 250.0 per 100,000 residents in 2023 — 49th of 58 counties. Reported infections included chlamydia at 197.6 per 100,000 (837 cases, 60% below the state rate), gonorrhea at 48.4 per 100,000 (205 cases, 75% below the state rate), syphilis at 4.0 per 100,000 (17 cases, too few for a reliable comparison). Many STDs show no symptoms, so testing is the only reliable way to know your status. Confidential options are available across Placer County.

STD Trends in Placer 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
197.6
per 100K in 2023
0.0 in 2000
Peak 288.2 in 2019
Gonorrhea
48.4
per 100K in 2023
0.0 in 2000
Peak 81.0 in 2017
Syphilis (P&S)
4.0
per 100K in 2023
0.0 in 2000
Peak 11.4 in 2020

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

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Placer County vs California and the US

Infection Placer County California US vs California vs US Rank in California
Chlamydia 197.6837 cases 491.1 490.7 59.8% below 59.7% below 48th of 58
Gonorrhea 48.4205 cases 190.2 178.2 74.6% below 72.8% below 47th of 58
Syphilis (P&S) 417 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

Placer County ranks 49th of 58 California counties for combined STD rate in 2023, at 250.0 per 100,000 residents.
In 2023, chlamydia was the most frequently reported STD in Placer County, with 837 cases at a rate of 197.6 per 100,000 residents.
STDTest.com lists confidential testing locations across Placer 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.