ZIP code 91765

Los Angeles County, including Diamond Bar

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Report created October 27, 2026 at www.firezones.info/zip/91765

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    55% Very High

    Most of the Very High land is in the State Responsibility Area, where the State Fire Marshal's zones apply.

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  • Fire history

    Share of the land inside a recorded wildfire perimeter

    45% has burned

    Most recently the 2021 Tonner Fire, which burned 2 acres here, one of 36 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    30% Extreme

    Utilities may shut off power in the CPUC High Fire-Threat District in fire weather, and homes outside it can lose power when their lines run through it.

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Land by 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 1 April 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

Largest fires

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

And 26 smaller fires. 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

Sources

Fire hazard severity zones
CAL FIRE Office of the State Fire Marshal
State map published 27 June 2025, local map 2 February 2026
Fire history
CAL FIRE Fire and Resource Assessment Program
Published 28 July 2026
Power line fire risk
California Public Utilities Commission
Published 23 February 2026

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

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