Who polices Diablo, and what they report
Diablo has no police department of its own: it’s an unincorporated community (a census-designated place) in Contra Costa County. The Contra Costa County Sheriff’s Office reports to the FBI for the parts of the county without police of their own, so there are no figures for Diablo alone, and no Safety Grade.
What stands out about safety in Diablo
Policed by the county
Diablo is a census-designated place, with no town government. Crimes there are reported to the FBI inside the Contra Costa County Sheriff’s Office’s totals for the county. County police ↓
Counts, not rates
The FBI doesn’t publish how many people the Contra Costa County Sheriff’s Office covers, so its totals can’t be turned into a per-resident rate or a grade for Diablo. County police ↓
The nearest graded towns
The closest California towns with their own police figures are Danville (A−, 2 mi), San Ramon (B, 5 mi), Walnut Creek (C−, 6 mi). Nearby towns can differ a lot from Diablo. Nearest ↓
Written from the FBI data on this page. Figures are crimes reported to police, not convictions.
What the Contra Costa County Sheriff’s Office reports
Crimes reported to the FBI for the whole area the department covers, by year.
Reports to the FBI for the parts of Contra Costa County without police of their own, which include Diablo.
Property crimes
Violent crimes
2025 offenses reported by the Contra Costa County Sheriff’s Office
Counts, not rates: the FBI doesn’t publish how many people each agency covers. FBI Uniform Crime Reporting, Tables 10–11.
The nearest California towns with a Safety Grade
Each town’s own police figures, per 1,000 residents a year, 2023–2025.
Straight-line distance from the center of Diablo. Nearby towns can differ a lot from Diablo.
One person died in crashes on Diablo’s roads in 2019–2023
Diablo had 1 fatal crash in five years, in which one person died; 1 was a cyclist.
That is about what is typical for California towns of 2,500–5,000 people: at their median rate (7.0 deaths per 100,000 residents a year), a town of Diablo’s size would see about 0 in five years. With numbers this small, a death or two either way changes the picture, so Diablo’s own rate (16.2) is context, not a ranking.
Deaths are counted where the crash happened, not where the people lived: a highway through town adds through-traffic deaths, and residents’ own risk on roads elsewhere isn’t here. Town rates sit below state and U.S. rates because a third of fatal crashes happen outside any town. Road safety is described here and is not part of the Safety Grade. Source: NHTSA Fatality Analysis Reporting System (FARS), 2019–2023.
Diablo and its neighbors
How reported crime compares across the town line. Tap a town to see its safety page.
Crimes reported to the FBI per 1,000 residents a year, 2023–2025. Blackhawk and Alamo are unincorporated communities (census-designated places) with no police department of their own.
What this data can and can’t tell you
- It’s reported crime. Only incidents reported to and recorded by police appear here. Many crimes are never reported to police.
- A county agency covers a wide area. Its totals mix many communities, so they say little about any one of them.
- Gaps are real gaps. A missing year means the department didn’t report a full year, not that nothing happened.
How the grade is calculated, for every town: How TownRatings grades safety →
Questions about safety in Diablo
Is Diablo, CA safe?
There is no Safety Grade for Diablo. Diablo has no police department of its own: it’s an unincorporated community (a census-designated place) in Contra Costa County. The Contra Costa County Sheriff’s Office reports to the FBI for the parts of the county without police of their own, so there are no figures for Diablo alone, and no Safety Grade. The nearest California towns with a grade are Danville (A−, 2 mi), San Ramon (B, 5 mi), Walnut Creek (C−, 6 mi).
Who polices Diablo?
The Contra Costa County Sheriff’s Office. Diablo is an unincorporated community, and the department reports to the FBI for the parts of Contra Costa County without police of their own.
Heads-up board
Neighbors looking out for each other in Diablo.
Your answer becomes a post in Town Square.
Please don’t name or describe individuals. In an emergency, call 911.
Crime: FBI Uniform Crime Reporting Program, Crime Data Explorer: offenses known to law enforcement by city, and state and national rates. Counts are crimes reported to police, not convictions. The Safety Grade is our own summary of that data, not an official rating. Road deaths: NHTSA Fatality Analysis Reporting System (FARS), 2019–2023. This isn’t an official statement of public safety. In an emergency, call 911.