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Opioid Overdoses and Approved Naloxone by County

There are two heat maps of California, displaying opioid overdoses and approved naloxone by county as of July 7, 2025.

1. Opioid Overdoses per 100,000 Residents (2023)

This heat map visualizes opioid overdose rates by county in California during the year 2023.

  • Darker colors indicate higher overdose rates.
  • Lighter colors indicate lower overdose rates.
  • In general, northern and rural counties have the highest overdose rates.
  • Urban and central areas such as Los Angeles and Sacramento counties show comparatively lower rates.
  • Counties with minimal or no reported overdoses include Modoc, Mono, and Trinity.

Overdose Rate by County (per 100,000 residents in 2023):

  • Alameda: 21.8
  • Alpine: 151.2
  • Amador: 18.9
  • Butte: 42.7
  • Calaveras: 28.2
  • Colusa: 23.3
  • Contra Costa: 16.6
  • Del Norte: 42.7
  • El Dorado: 19.6
  • Fresno: 13.8
  • Glenn: 36.0
  • Humboldt: 50.3
  • Imperial: 10.4
  • Inyo: 16.3
  • Kern: 37.0
  • Kings: 10.3
  • Lake: 43.8
  • Lassen: 39.7
  • Los Angeles: 17.1
  • Madera: 8.7
  • Marin: 16.1
  • Mariposa: 16.7
  • Mendocino: 41.2
  • Merced: 15.7
  • Modoc: 0.0
  • Mono: 0.0
  • Monterey: 12.0
  • Napa: 11.8
  • Nevada: 37.7
  • Orange: 19.2
  • Placer: 14.6
  • Plumas: 10.5
  • Riverside: 24.2
  • Sacramento: 22.1
  • San Benito: 19.3
  • San Bernardino: 19.8
  • San Diego: 20.0
  • San Francisco: 54.8
  • San Joaquin: 23.8
  • San Luis Obispo: 30.0
  • San Mateo: 12.5
  • Santa Barbara: 16.3
  • Santa Clara: 11.0
  • Santa Cruz: 45.9
  • Shasta: 40.1
  • Sierra: 84.2
  • Siskiyou: 40.1
  • Solano: 16.0
  • Sonoma: 21.3
  • Stanislaus: 28.0
  • Sutter: 19.1
  • Tehama: 45.1
  • Trinity: 0.0
  • Tulare: 14.7
  • Tuolumne: 37.2
  • Ventura: 27.9
  • Yolo: 12.9
  • Yuba: 26.9

2. Approved Naloxone Kits per 100,000 Residents (2018–2025)

This heat map represents the rate of naloxone kits approved and distributed per 100,000 residents by county between 2018 and 2025.

  • Darker shading indicates higher naloxone distribution.
  • Lighter shading indicates lower distribution rates.
  • Urban and central/southern counties have higher naloxone distribution.
  • Rural and northern counties tend to have lower access.

Naloxone Distribution Rate by County (per 100,000 residents, 2018–2025):

  • Alameda: 19,611.1
  • Alpine: 80,135.2
  • Amador: 42,711.2
  • Butte: 26,494.5
  • Calaveras: 12,775.3
  • Colusa: 9,124.6
  • Contra Costa: 6,663.9
  • Del Norte: 72,895.5
  • El Dorado: 11,529.9
  • Fresno: 13,006.4
  • Glenn: 15,375.9
  • Humboldt: 78,082.0
  • Imperial: 25,680.5
  • Inyo: 61,874.0
  • Kern: 25,723.4
  • Kings: 31,300.1
  • Lake: 78,143.3
  • Lassen: 61,784.6
  • Los Angeles: 16,009.8
  • Madera: 27,197.9
  • Marin: 32,676.0
  • Mariposa: 3,394.6
  • Mendocino: 59,886.6
  • Merced: 6,412.5
  • Modoc: 23,714.9
  • Mono: 35,564.3
  • Monterey: 38,074.2
  • Napa: 14,238.6
  • Nevada: 40,301.0
  • Orange: 13,011.0
  • Placer: 6,908.8
  • Plumas: 35,086.6
  • Riverside: 11,696.5
  • Sacramento: 26,207.4
  • San Benito: 12,614.1
  • San Bernardino: 5,492.2
  • San Diego: 13,064.1
  • San Francisco: 59,549.0
  • San Joaquin: 7,540.7
  • San Luis Obispo: 29,330.5
  • San Mateo: 4,476.6
  • Santa Barbara: 13,813.7
  • Santa Clara: 9,057.2
  • Santa Cruz: 48,532.3
  • Shasta: 20,962.2
  • Sierra: 36,146.8
  • Siskiyou: 34,701.8
  • Solano: 16,929.1
  • Sonoma: 22,622.0
  • Stanislaus: 18,021.3
  • Sutter: 11,725.4
  • Tehama: 13,185.0
  • Trinity: 9,633.7
  • Tulare: 3,625.2
  • Tuolumne: 61,904.6
  • Ventura: 7,443.0
  • Yolo: 9,841.5
  • Yuba: 32,661.1

SOURCES: Any Opioid-Related Overdose Deaths – California Department of Public Health, “California Opioid Overdose Surveillance Dashboard”; accessed April 2025. Population data – State of California Department of Finance, “E-1 Cities, Counties, and the State Population Estimates with Annual Percent Change – January 1, 2023 and 2024”; accessed April 2025. Naloxone kits as of June 9, 2025.