STD Rates in Los Angeles County, California

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

Data Year: 2023 Source: CDC STI Surveillance Population: 9,662,959
Combined
915.7
per 100K
3rd / 58
Chlamydia
602.3
per 100K • 58,200 cases
US rate: 490.7
6th of 58 in California
Higher than 85% of US counties
Gonorrhea
291.8
per 100K • 28,195 cases
US rate: 178.2
2nd of 58 in California
Higher than 92% of US counties
Syphilis P&S
21.6
per 100K • 2,085 cases
US rate: 15.8
10th of 58 in California
Higher than 82% of US counties

Los Angeles County has one of the higher STD burdens in California, with a combined rate of 915.7 per 100,000 residents in 2023 — ranking 3rd of 58 counties. Reported infections included chlamydia at 602.3 per 100,000 (58,200 cases, 23% above the state rate), gonorrhea at 291.8 per 100,000 (28,195 cases, 53% above the state rate), syphilis at 21.6 per 100,000 (2,085 cases, 33% above the state rate). Confidential STD testing is available throughout Los Angeles County — knowing your status is the only way to catch infections that often show no symptoms.

STD Trends in Los Angeles 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
602.3
per 100K in 2023
0.0 in 2000
Peak 694.4 in 2019
Gonorrhea
291.8
per 100K in 2023
0.0 in 2000
Peak 316.4 in 2021
Syphilis (P&S)
21.6
per 100K in 2023
1.6 in 2000
Peak 27.3 in 2021

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

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Los Angeles County vs California and the US

Infection Los Angeles County California US vs California vs US Rank in California
Chlamydia 602.358,200 cases 491.1 490.7 22.6% above 22.7% above 6th of 58
Gonorrhea 291.828,195 cases 190.2 178.2 53.4% above 63.7% above 2nd of 58
Syphilis (P&S) 21.62,085 cases 16.3 15.8 32.5% above 36.7% above 10th of 58

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

Los Angeles County ranks 3rd of 58 California counties for combined STD rate in 2023, at 915.7 per 100,000 residents.
In 2023, chlamydia was the most frequently reported STD in Los Angeles County, with 58,200 cases at a rate of 602.3 per 100,000 residents.
STDTest.com lists confidential testing locations across Los Angeles 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.