California: 58 counties covered

Across 58 California counties with a FEMA flood score, the average national percentile is 85.8 — but that average hides real spread between counties, which is why each one gets its own page rather than a single statewide number.

• Los Angeles County — 100th percentile, Very High
• San Diego County — 99.7th percentile, Very High
• Orange County — 99.8th percentile, Very High
• Riverside County — 99.9th percentile, Very High
• San Bernardino County — 99.8th percentile, Very High
• Santa Clara County — 99.8th percentile, Very High
• Alameda County — 99.7th percentile, Very High
• Sacramento County — 99th percentile, Relatively High
• Contra Costa County — 99.5th percentile, Very High
• Fresno County — 98.7th percentile, Relatively High
• Kern County — 98.5th percentile, Relatively High
• Ventura County — 99.3th percentile, Very High
• San Francisco County — 98.6th percentile, Relatively High
• San Joaquin County — 97.7th percentile, Relatively High
• San Mateo County — 98.4th percentile, Relatively High
• Stanislaus County — 96th percentile, Relatively High
• Sonoma County — 99.2th percentile, Relatively High
• Tulare County — 98.1th percentile, Relatively High
• Solano County — 97.4th percentile, Relatively High
• Santa Barbara County — 98.6th percentile, Relatively High
• Monterey County — 97.3th percentile, Relatively High
• Placer County — 95.8th percentile, Relatively High
• Merced County — 94.7th percentile, Relatively High
• San Luis Obispo County — 96.7th percentile, Relatively High
• Santa Cruz County — 96.2th percentile, Relatively High
• Marin County — 97.2th percentile, Very High
• Yolo County — 89.6th percentile, Relatively Moderate
• Butte County — 93.2th percentile, Relatively Moderate
• El Dorado County — 91.7th percentile, Relatively Moderate
• Imperial County — 94.1th percentile, Relatively High
• Shasta County — 94.8th percentile, Relatively High
• Madera County — 94th percentile, Relatively High
• Kings County — 87.7th percentile, Relatively Moderate
• Napa County — 95.8th percentile, Relatively High
• Humboldt County — 94.2th percentile, Relatively High
• Nevada County — 89.9th percentile, Relatively Moderate
• Sutter County — 71.4th percentile, Relatively Low
• Mendocino County — 95.1th percentile, Relatively High
• Yuba County — 83.8th percentile, Relatively Moderate
• San Benito County — 69.4th percentile, Relatively Low
• Lake County — 94.1th percentile, Relatively High
• Tehama County — 90th percentile, Relatively Moderate
• Tuolumne County — 81th percentile, Relatively Moderate
• Calaveras County — 77.6th percentile, Relatively Moderate
• Siskiyou County — 90.9th percentile, Relatively Moderate
• Amador County — 70th percentile, Relatively Low
• Lassen County — 74.4th percentile, Relatively Moderate
• Glenn County — 42.3th percentile, Relatively Low
• Del Norte County — 77.8th percentile, Relatively Moderate
• Colusa County — 37.9th percentile, Relatively Low
• Plumas County — 87.9th percentile, Relatively Moderate
• Inyo County — 61.6th percentile, Relatively Low
• Mariposa County — 70.8th percentile, Relatively Low
• Trinity County — 79th percentile, Relatively Moderate
• Mono County — 46.9th percentile, Relatively Low
• Modoc County — 44.8th percentile, Relatively Low
• Sierra County — 37.7th percentile, Relatively Low
• Alpine County — 11.2th percentile, Very Low