CA DOI Zones

The California Department of Insurance (DOI) has divided California into eight zones and six sub zones (generally corresponding to counties) to help insurance companies manage their total exposures. Generally speaking, the higher in the alphabet the greater the risk (Zones A and B = high risk, Zones F, G, and H = less risk).

Zone Name

Counties

A1

San Francisco
San Mateo

A2

Alameda

Contra Costa

A3

Del Norte

Humboldt

Lake

Marin

Mendocino

Monterey

Napa

San Benito

Santa Clara

Santa Cruz

Solano

Sonoma

B1

Los Angeles county west of Interstate 5 and south of Mulholland Drive

B2

Remainder of Los Angeles county area not covered by zone B1

B3

Orange

C

Kern

San Luis Obispo

Santa Barbara

Ventura

D

San Diego

E

Alpine

Imperial

Inyo

Mono

Riverside

San Bernardino

F

Fresno

Kings

Madera

Mariposa

Merced

Tulare

G

Amador

Butte

Calaveras

Colusa

El Dorado

Glenn

Nevada

Placer

Sacramento

San Joaquin

Stanislaus

Sutter

Tuolumne

Yolo

Yuba

H

Lassen

Modoc

Plumas

Shasta

Sierra

Siskiyou

Tehama

Trinity

 

 


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Touchstone 7.0 Updated September 03, 2020