Photo: Thebluewriter · CC BY-SA 4.0Diamond Bar reports less violent crime than most U.S. towns, but more property crime
Overall, Diamond Bar grades C+ for safety (#121 of 416 graded towns in California): close to the middle of U.S. towns, on crimes its police reported to the FBI in 2023–2025.
Crimes reported to the FBI per 1,000 residents a year, 2023–2025. “Rest of CA” is every other California city and town in the FBI’s tables; the U.S. figure is the FBI’s national estimate as published, averaged over the three years. The FBI publishes no national homicide or robbery rate in our data, so those compare with all U.S. cities and towns in its tables.
What stands out about safety in Diamond Bar
Diamond Bar reports less crime than every graded town next door
Of the 3 California towns on Diamond Bar’s borders, 1 have a Safety Grade: Pomona (D). Rowland Heights is an unincorporated community (a census-designated place) with no police department of its own. Chino Hills reported to the FBI for 2024 and 2025 but not 2023. Neighbors ↓
Among California towns, closer to the middle
California’s cities and towns report more crime than most states’, so Diamond Bar’s place among its own towns differs from its national one: it reports less crime than 71% of the 416 California towns we grade, against 41% nationally. Safety Grade ↓
Reported crime is falling
Crime reported per resident fell from 2023 to 2025 by more than ordinary year-to-year swings, on the grade’s own score. Trend ↓
Written from the FBI data on this page. Figures are crimes reported to police, not convictions.
What’s behind Diamond Bar’s grade
Property crimes plus four times violent crimes reported to the FBI per resident, 2023–2025, on a national curve. Violent crime holds Diamond Bar’s grade up; property crime pulls it down.
Violent crime, by year and by type
Diamond Bar’s police reported 174 violent crimes to the FBI over 2023–2025, about 1.1 per 1,000 residents a year, against 4.9 in the rest of California and the FBI’s national estimate of 3.6.
Show as a table
| Year | Diamond Bar | Rest of California | U.S. (FBI national estimate) |
|---|---|---|---|
| 2022 | 1.7 | 5.1 | 4.0 |
| 2023 | 1.3 | 5.4 | 3.9 |
| 2024 | 0.8 | 4.9 | 3.6 |
| 2025 | 1.2 | 4.3 | 3.3 |
Violent crimes per 1,000 residents
By type 2023–2025, counts
Reported crime is falling
Reported crime per resident fell from 2023 to 2025, by more than ordinary year-to-year swings. Per 1,000 residents, 2022–2025, against the rest of California.
Show as a table
| Year | Diamond Bar property | Rest of California property | Diamond Bar violent | Rest of California violent |
|---|---|---|---|---|
| 2022 | 18.4 | 24.8 | 1.7 | 5.1 |
| 2023 | 19.3 | 25.0 | 1.3 | 5.4 |
| 2024 | 18.6 | 20.8 | 0.8 | 4.9 |
| 2025 | 16.3 | 18.5 | 1.2 | 4.3 |
Crimes per 1,000 residents
For every 1,000 residents, about 16 property crimes reported
And about 1 violent crime, in 2025. Below are 1,000 dots, one per resident; each colored dot is one reported crime.
Violent crime per 1,000 residents, 2025
Property crime per 1,000 residents, 2025
Crimes reported to police in 2025 per resident; one person can be the victim of more than one, and some reports involve visitors.
908 crimes reported in 2025
64 violent and 844 property, as reported to the FBI by Diamond Bar’s police.
2025 offenses reported
Offenses reported to police, not convictions. FBI Uniform Crime Reporting. The last row is counted outside the property total.
23 people died in crashes on Diamond Bar’s roads in 2019–2023
Diamond Bar had 23 fatal crashes in five years, in which 23 people died; 8 were pedestrians.
That is 8.6 deaths per 100,000 residents a year, above the median for California towns of 25,000–100,000 people (5.6, 231 towns).
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.
Diamond Bar and its neighbors
How reported crime compares across the town line. Tap a town to see its safety page.
| Town | Grade | Violent | Property |
|---|---|---|---|
| Diamond Bar | C+ | 1.1 | 18.1 |
| Pomona | D | 6.8 | 26.5 |
| Rowland Heights | — | — | — |
| Chino Hills | — | — | — |
Crimes reported to the FBI per 1,000 residents a year, 2023–2025. Rowland Heights is an unincorporated community (a census-designated place) with no police department of its own. Chino Hills reported to the FBI for 2024 and 2025 but not 2023.
California towns of a similar size
| Town | Grade | Violent | Property |
|---|---|---|---|
| Diamond Bar | C+ | 1.1 | 18.1 |
| Delano | C+ | 3.3 | 11.2 |
| Cathedral City | C+ | 3.0 | 12.4 |
| Novato | C+ | 2.6 | 14.4 |
| Paramount | D | 6.4 | 26.6 |
| Huntington Park | D | 6.7 | 33.8 |
The five graded California towns closest to Diamond Bar’s population (51,884), by grade.
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.
- One number for all of Diamond Bar. A citywide rate doesn’t show where incidents happen, and that can differ a lot from one part of the city to another.
- Visitors count too. Incidents involving people who work, shop or visit are counted against Diamond Bar’s residents, which raises the per-resident rate.
- Whose population. Rates use the FBI’s population for the department (51,635 in 2025); our figure for Diamond Bar is 51,884 (2025 Census estimate).
- 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 Diamond Bar
Is Diamond Bar, CA safe?
On crimes reported to the FBI in 2023–2025, Diamond Bar reports more crime per resident than 59% of U.S. towns, a C+ Safety Grade and #121 of 416 in California. Its police reported 1.1 violent crimes per 1,000 residents a year, against 4.9 in the rest of California and the FBI’s national estimate of 3.6.
What is the crime rate in Diamond Bar?
1.1 violent and 18.1 property crimes per 1,000 residents a year, 2023–2025, as reported to the FBI. The rest of California reports 4.9 and 21.4; the FBI’s national estimate is 3.6 and 17.6.
Is crime going up or down in Diamond Bar?
Reported crime per resident fell from 2023 to 2025, by more than ordinary year-to-year swings.
How many homicides were there in Diamond Bar in 2025?
Diamond Bar’s police reported 0 homicides to the FBI for 2025, 0.0 per 100,000 residents. Across U.S. cities and towns in the FBI’s tables the 2025 figure was 4.6.
Is Diamond Bar safer than Pomona?
Pomona reports more crime per resident than Diamond Bar: Pomona grades D for safety and Diamond Bar C+. Pomona’s police reported 6.8 violent and 26.5 property crimes per 1,000 residents a year, 2023–2025.
Who polices Diamond Bar?
Diamond Bar’s own police department, which reports to the FBI as “Diamond Bar”. Its figures are the ones on this page.
Heads-up board
Neighbors looking out for each other in Diamond Bar.
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, 2025, 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.