We care for patients across San Francisco, San Mateo, Santa Clara, Santa Cruz, Alameda, Contra Costa, Solano, Napa, Yolo, Placer, El Dorado, Sacramento, Marin, and Sonoma counties. While 21st Century Home Health makes every effort to maintain your primary territory, temporary reassignments may be necessary to ensure safe, high-quality patient care and to meet the needs of our growing organization.