ZIP code 91765

Los Angeles County, including Diamond Bar

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Report created October 31, 2026 at www.firezones.org/zip/91765

Summary

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    1. Very High 6,519 acres · 3,561 state, 2,959 local 55%
    2. High 1,762 acres · Local Responsibility Area 15%
    3. Moderate 661 acres · Local Responsibility Area 6%
    4. Non-wildland 2,944 acres · Local Responsibility Area 25%

    11,887 acres of land in all, 3,561 in the State Responsibility Area and 8,326 in the Local. State zones are the ones the State Fire Marshal designated, in effect since April 1, 2024. Local zones are CAL FIRE's 2025 recommendation, which each city or county adopts by ordinance and can make stricter. How to read fire zones

  • Fire history

    The 10 largest of 36 fires that burned here

    1. 1980 Carbon Fire 6,955 acres in total 2,262 acres here
    2. 2008 Freeway Fire 30,305 acres in total · Cause: Vehicle 2,100 acres here
    3. 1946 Diamond F141 Fire 919 acres here
    4. 1990 Carbon Canyon Fire 4,978 acres in total 906 acres here
    5. 1929 Kelly No. 41 Fire 1,347 acres in total 740 acres here
    6. 1972 Golden Springs Fire 718 acres here
    7. 1967 Firestone Fire 236 acres in total 217 acres here
    8. 1957 Unnamed fire 281 acres in total 121 acres here
    9. 1988 Diamond Bar Fire 119 acres here
    10. 1947 Arnold No. 106 Fire 1,907 acres in total 111 acres here

    And 26 smaller fires. The most recent was the 2021 Tonner Fire, which burned 2 acres here. In all, 5,327 acres of ZIP code 91765 have burned. Acres are the land each fire burned here, and fires that crossed less than an acre are not counted. Some older or smaller fires may be missing, and a fire perimeter can include unburned patches. How to read fire history

Nearby areas

Communities in ZIP code 91765

Neighboring ZIP codes

  1. 91765 55% Very High · this area
  2. 91709 73% Very High
  3. 91748 45% Very High
  4. 91766 15% High
  5. 91768 18% High · 4% Very High
  6. 91789 17% Very High
  7. 92821 57% Very High
  8. 92823 92% Very High

Sources

Fire hazard severity zones
CAL FIRE Office of the State Fire Marshal
State map published June 27, 2025, local map February 2, 2026
Fire history
CAL FIRE Fire and Resource Assessment Program
Published July 28, 2026

This site is independent and not affiliated with CAL FIRE, so for an official determination, check with the agency or your city or county. How we read the data