| Business | Phone |
| Contra Costa Area Agency-Aging 2530 Arnold Dr # 300, Martinez 94553 | (925) 313-1700 |
| Contra Costa Social Svc 40 Douglas Dr, Martinez 94553 | (925) 313-1500 |
| Aging & Adult Svc Bureau 2530 Arnold Dr # 300, Martinez 94553 | (925) 335-8700 |
| Contra Costa Child Abuse 2530 Arnold Dr # 200, Martinez 94553 | (510) 374-3324 |