ZIP code 92503

Riverside County, including Riverside, El Sobrante, Corona and others

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Report created October 27, 2026 at www.firezones.info/zip/92503

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    49% 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

    28% has burned

    Most recently the 2024 Clay Fire, which burned 15 acres here, one of 23 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    20% 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 12,044 acres · 8,930 state, 3,114 local 49%
  2. High 1,710 acres · 830 state, 880 local 7%
  3. Moderate 3,700 acres · 2,362 state, 1,338 local 15%
  4. Non-wildland 7,247 acres · Local Responsibility Area 29%

24,702 acres of land in all, 12,122 in the State Responsibility Area and 12,580 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. 1978 Unnamed fire 2,157 acres
  2. 1980 Pierce Fire 985 acres
  3. 1983 Mckinley Fire Of 1,607 acres in all · Cause: Playing with fire 958 acres
  4. 2007 Mockingbird Fire Of 737 acres in all 726 acres
  5. 2010 Mckinley Fire Of 1,028 acres in all · Cause: Equipment use 701 acres
  6. 1989 River Fire Of 962 acres in all 554 acres
  7. 1978 Unnamed fire 507 acres
  8. 2007 Sierra Fire Of 778 acres in all 469 acres
  9. 1995 Water Fire Cause: Equipment use 336 acres
  10. 1975 Unnamed fire Of 1,954 acres in all 326 acres

And 13 smaller fires. In all, 6,794 acres of ZIP code 92503 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 92503

Neighboring ZIP codes

  1. 92503 49% Very High · this area
  2. 91752 7% Moderate · 1% Very High
  3. 92504 21% Very High
  4. 92505 32% Very High
  5. 92509 30% Very High
  6. 92570 71% Very High
  7. 92860 24% Very High
  8. 92879 17% Very High
  9. 92881 25% Very High
  10. 92883 54% Very High