Crime in Diamond Bar, California
Major crime in Diamond Bar is 19% above the U.S. rate per resident: 61% lower for persons crimes and 37% higher for property crimes. Expected major crimes are down 9.1% from a year earlier.
Modeled estimates per resident, not counts of incidents. How we calculated this
Index: crimes per resident compared with the U.S., where 100 is the U.S. rate and 200 is twice it.
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Burglary stands out most, at 5.0 times the U.S. rate
Expected crimes per year in Diamond Bar for each type, and the index against the U.S. rate per resident.
Citywide indexWhere the middle half of residents live
Property crimes
Social disorder
How crime varies across Diamond Bar
The middle half of Diamond Bar residents live in neighborhoods with a major-crime index between 49 and 119; the typical (median) resident's is 79. The citywide figure (119) is higher than that because crime concentrates in a smaller set of areas.
- 0–5028.9%
- 50–10035.0%
- 100–20021.2%
- 200–40012.0%
- 400+2.9%
Share of residents by the index of their census block group, a neighborhood of roughly 600 to 3,000 people.
Highest on weeknights
Major-crime index by time of week, against the U.S. rate for the same hours.
Major crime fell 9.1% in a year; across California it fell 7.4%
Change in expected crimes, with California as a whole in gray. The past year uses the reporting agencies' year-to-date FBI data; 2031 is the model's projection.
Diamond Bar against U.S. places with 50,000 to 100,000 residents
171 of the 540 other places of this size have a higher major-crime index than Diamond Bar; the middle of the group is 92. The 9 nearest in population:
Major-crime index per resident, U.S. = 100; residents in gray.
Diamond Bar has a higher major-crime index than 5 of its 8 nearest neighbors
The 8 nearest cities and towns we cover, by major-crime index. The closest, Walnut (3 mi), is 37% below Diamond Bar's rate.
Major-crime index per resident, U.S. = 100; distances between where residents live, in miles.
Questions about crime in Diamond Bar
What are the most common crimes in Diamond Bar?
By expected count, the most common persons and property crimes are burglary (about 419 a year), theft from vehicle (about 173 a year) and other larceny (about 168 a year). Compared with the U.S., burglary stands out most: 5.0 times the U.S. rate per resident.
How we calculated this
Each police agency's crimes, as reported to the FBI, are spread across the census block groups it serves using population, jobs, points of interest and, where available, local incident records. Diamond Bar's figures add up its 27 block groups. The index compares crimes per resident with the U.S. rate.
- Diamond Bar's published incident records inform the estimate for every neighborhood.
- 2.9% of residents live in block groups whose estimate has high confidence (80% interval within about 5x).
- Rates are per resident, so places where many people work or visit but few live, such as downtowns, airports and stadiums, can read high.
- Disorderly conduct and trespassing are modeled, because the FBI records them only through arrests.
- Residents: 51,179. Model updated Oct 20, 2026. Release 2026-2026-10-20-2
Full method and validation·Data sources
CrimeMetric. "Crime in Diamond Bar, California." Vorp Labs, model updated Oct 20, 2026. https://crimemetric.com/ca/diamond-bar
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Major-crime index, U.S. = 100
- Walnut3 mi76
- Rowland Heights4 mi157
- South San Jose Hills5 mi85
- Pomona6 mi183
- Chino Hills6 mi47
- Brea6 mi135
- West Covina7 mi115
- Valinda7 mi69