California’s Deadliest Counties: Study Reveals Where Injury Fatalities Are Rising.

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• Study measured fatal injuries from both intentional causes, as well as unintentional accidents, over 5 years.
• Alpine County emerged as the most dangerous; Sierra the least.
• Infographic included.

A recent study by MyBioSource has identified Alpine County as the most dangerous county in California, in terms of injury-related fatalities. The analysis, which examined data from 2020 to 2024, found that Alpine County experienced a dramatic increase of 99 deaths per 100,000 people, the highest rise of any county in the state.
The study measured fatal injuries from both intentional causes, such as homicides and suicides, as well as unintentional accidents, including motor vehicle crashes, falls, and other preventable incidents. The findings highlight a concerning trend, with several rural counties experiencing a sharp increase in fatalities over the past five years.
Counties With the Most Significant Rise in Injury-Related Deaths 
Beyond Alpine County, several others have seen a steep climb in injury-related deaths. The top 5 counties with the highest increases in fatal injury rates per 100,000 people over five years include:

1. Alpine County: +99
2. Trinity County: +34
3. Mendocino County: +29
4. San Francisco County: +22
5. Lake County: +19

Several counties ranked among the most dangerous are sparsely populated rural areas, where access to emergency medical services may be limited, potentially exacerbating fatal outcomes. 

On the other hand, the 5 safest counties in the state are:
​Sierra: -43;
Colusa: -13;
Plumas: -12;
Tuolumne: -6;
Humboldt: -5.

States With the Highest Increase in Injury Deaths 
When analyzed on a state level, the study found that West Virginia had the most significant increase in injury-related fatalities, rising by 23 deaths per 100,000 people over five years. This aligns with data showing a continued struggle with high rates of opioid-related deaths, workplace injuries, and motor vehicle accidents. The top five states with the most substantial increases in injury-related deaths were: 
1. West Virginia: +23 per 100,000
2. Louisiana: +20 per 100,000
3. Tennessee: +19 per 100,000
4. Delaware: +17 per 100,000
5. Maine: +17 per 100,000 
Notably, Southern and Appalachian states dominate the list, pointing to potential regional factors such as higher rates of workplace accidents, firearm-related deaths, and drug overdoses. California emerged in 25th place overall, with an increase of 9 per 100,000 people.
Infographic showing state rankings
“The study underscores the need for improved safety measures, enhanced access to emergency healthcare, and targeted public health interventions to reduce fatal injuries across the U.S.”, says a spokesperson for MyBioSource. 
Methodology
Data taken from County Health Rankings comparing the change in rate of injury related deaths per 100,000 people over five years (2020-2024). Injury Deaths refer to the number of fatalities caused by injuries per 100,000 people. This measure includes both intentional injuries, such as homicide and suicide, as well as unintentional injuries, like motor vehicle accidents. The rate represents the number of occurrences (e.g., deaths, births) within a specific time frame, divided by the average population at risk during that period. Using rates enables meaningful comparisons across states and counties with varying population sizes.


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