Current membership includes PRAs from these counties:​

  • Alameda

  • Alpine

  • Colusa

  • Del Norte

  • Fresno

  • Humboldt

  • Inyo

  • Kings

  • Lake

  • Los Angeles

  • Marin

  • Merced

  • Modoc

  • Mono

  • 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