ZIP code 91766

Los Angeles and San Bernardino counties, including Pomona

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Report created October 27, 2026 at www.firezones.info/zip/91766

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    15% High

    All of the High land is in the Local Responsibility Area, where each city or county adopts the zones CAL FIRE recommends.

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  • Fire history

    Share of the land inside a recorded wildfire perimeter

    16% has burned

    Most recently the 2009 Diamond Fire, which burned 26 acres here, one of 14 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    <1% Elevated

    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. High 976 acres · Local Responsibility Area 15%
  2. Moderate 217 acres · Local Responsibility Area 3%
  3. Non-wildland 5,273 acres · Local Responsibility Area 82%

6,466 acres of land in all, 6,466 of it in the Local Responsibility Area. 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. 1929 Kelly No. 41 Fire Of 1,347 acres in all 606 acres
  2. 1949 Richards No. 179 Fire 305 acres
  3. 1928 Diamond No. 101 Fire Of 261 acres in all 168 acres
  4. 1957 Unnamed fire Of 281 acres in all 160 acres
  5. 1974 Unnamed fire 112 acres
  6. 1971 Unnamed fire 107 acres
  7. 1974 Unnamed fire 98 acres
  8. 1985 Elephant Hill Fire 89 acres
  9. 2008 Storrs Fire 82 acres
  10. 1929 Le Claire No. 67 Fire Of 162 acres in all 79 acres

And 4 smaller fires. In all, 1,056 acres of ZIP code 91766 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 91766

Neighboring ZIP codes

  1. 91766 15% High · this area
  2. 91709 73% Very High
  3. 91710 No hazard zones
  4. 91762 No hazard zones
  5. 91763 No hazard zones
  6. 91765 55% Very High
  7. 91767 No hazard zones
  8. 91768 18% High · 4% Very High