STD Rates in Orange County, California

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

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Data Year: 2023 Source: CDC STI Surveillance Population: 3,135,391
Combined
508.5
per 100K
23rd / 58
Chlamydia
369.3
per 100K • 11,579 cases
US rate: 490.7
24th of 58 in California
Higher than 65% of US counties
Gonorrhea
127.7
per 100K • 4,005 cases
US rate: 178.2
16th of 58 in California
Higher than 72% of US counties
Syphilis P&S
11.5
per 100K • 361 cases
US rate: 15.8
35th of 58 in California
Higher than 65% of US counties

Orange County reported a combined STD rate of 508.5 per 100,000 residents in 2023, placing it 23rd of 58 California counties — in the upper half of the state. Reported infections included chlamydia at 369.3 per 100,000 (11,579 cases, 25% below the state rate), gonorrhea at 127.7 per 100,000 (4,005 cases, 33% below the state rate), syphilis at 11.5 per 100,000 (361 cases, 29% below the state rate). Routine testing is the surest way to catch STDs early, since many produce no symptoms. Orange County has confidential testing locations available.

STD Trends in Orange 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
369.3
per 100K in 2023
0.0 in 2000
Peak 449.2 in 2018
Gonorrhea
127.7
per 100K in 2023
0.0 in 2000
Peak 168.6 in 2021
Syphilis (P&S)
11.5
per 100K in 2023
0.9 in 2000
Peak 17.6 in 2021

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

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Orange County vs California and the US

Infection Orange County California US vs California vs US Rank in California
Chlamydia 369.311,579 cases 491.1 490.7 24.8% below 24.7% below 24th of 58
Gonorrhea 127.74,005 cases 190.2 178.2 32.9% below 28.3% below 16th of 58
Syphilis (P&S) 11.5361 cases 16.3 15.8 29.4% below 27.2% below 35th 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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Largest cities in Orange County, California

Largest first, by Census population. Each city page lists nearby clinics, free and low-cost testing, and labs.

STD testing in Anaheim, CA344,521 people → STD testing in Santa Ana, CA312,534 people → STD testing in Irvine, CA311,690 people → STD testing in Huntington Beach, CA195,240 people → STD testing in Garden Grove, CA170,964 people → STD testing in Fullerton, CA140,968 people → STD testing in Orange, CA138,266 people → STD testing in Costa Mesa, CA110,330 people → STD testing in Mission Viejo, CA92,151 people → STD testing in Westminster, CA89,860 people →
Show all 37 cities ↓Show fewer cities ↑
STD testing in Lake Forest, CA86,281 people → STD testing in Newport Beach, CA83,845 people → STD testing in Buena Park, CA82,871 people → STD testing in Tustin, CA78,981 people → STD testing in Yorba Linda, CA67,170 people → STD testing in Laguna Niguel, CA64,139 people → STD testing in San Clemente, CA63,273 people → STD testing in La Habra, CA61,970 people → STD testing in Fountain Valley, CA56,258 people → STD testing in Placentia, CA52,826 people → STD testing in Aliso Viejo, CA51,113 people → STD testing in Cypress, CA49,498 people → STD testing in Brea, CA47,469 people → STD testing in Rancho Santa Margarita, CA46,990 people → STD testing in Stanton, CA39,402 people → STD testing in San Juan Capistrano, CA35,095 people → STD testing in Dana Point, CA32,790 people → STD testing in Laguna Hills, CA30,740 people → STD testing in North Tustin, CA25,807 people → STD testing in Seal Beach, CA24,722 people → STD testing in Ladera Ranch, CA23,793 people → STD testing in Laguna Beach, CA22,710 people → STD testing in Laguna Woods, CA17,289 people → STD testing in La Palma, CA15,272 people → STD testing in Coto De Caza, CA15,190 people → STD testing in Los Alamitos, CA11,794 people → STD testing in Rossmoor, CA11,532 people →

Largest Counties in California

Los Angeles County → San Diego County → Riverside County → San Bernardino County → Santa Clara County → Alameda County → Sacramento County → Contra Costa County → Fresno County → Kern County →

All 58 California counties → STD testing in California →

FAQs

Orange County ranks 23rd of 58 California counties for combined STD rate in 2023, at 508.5 per 100,000 residents.
In 2023, chlamydia was the most frequently reported STD in Orange County, with 11,579 cases at a rate of 369.3 per 100,000 residents.
STDTest.com lists confidential testing locations across Orange County and California. Many offer same-day appointments with results in 1–3 days.

Related Resources

STD Testing Window Periods How Soon After Sex to Test STD Symptoms Guide Testing Timeline Chart All Testing Clinics STD Statistics and Data
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.
Sources