Current membership includes PRAs from these counties:​

• Alameda

• Alpine

• Colusa

• Del Norte

• Fresno

• Humboldt

• Inyo

• Kings

• Lake

• Los Angeles

• Marin

• Merced

• Modoc

• Monterey

• Napa

• Nevada

• Placer

• Riverside

• Sacramento

• San Bernardino

• San Diego

• San Francisco

• San Mateo

• Santa Barbara

• Santa Clara

• Shasta

• Sierra

• Siskiyou

• Solano

• Sonoma

• Stanislaus

• Sutter

• Tehama

• Trinity

• Tulare

• Yolo

• Yuba